Definitions
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An extremely rare condition in which a female has two extra X chromosomes.
A
An enlarged area in the lower part of the aorta, a major blood vessel.
Bloating and swelling in the belly area.
Excess weight that develops over time around the center of the body, also called visceral fat.
Pain from inside the abdomen or the outer muscle wall, ranging from mild and temporary to severe and requiring emergency care.
An injury caused by something that rubs or scrapes against the skin or tissue.
A confined pocket of pus that collects in tissues, organs, or spaces inside the body.
A skin condition characterized by dark, velvety patches in body folds and creases.
A rare disorder making it difficult for food and liquid to pass into the stomach.
An injury of the Achilles tendon, which connects the calf muscle to the heel bone.
A partial or complete tear of the tendon just above the heel. The injury makes it hard to raise the foot or walk properly.
Last Updated: Jun 24, 2023The most common type of short-limbed dwarfism.
A buildup of acid in the body.
A skin condition that occurs when hair follicles plug with oil and dead skin cells.
A disorder in adults in which the pituitary gland produces too much growth hormone.
A rough, scaly patch on the skin caused by years of sun exposure.
Any condition brought on by a sudden reduction or blockage of blood flow to the heart.
A type of cancer of the blood and bone marrow that affects white blood cells.
A type of cancer of the blood and bone marrow that affects mature blood cell growth.
Sudden inflammation in the pancreas.
A condition in which the kidneys suddenly can't filter waste from the blood.
Condition in which fluid collects in the lungs' air sacs, depriving organs of oxygen.
A disorder in which the adrenal glands don't produce enough hormones.
Inflammation of a gland or infection-fighting node (lymph node).
A form of cancer that starts in the cells that line certain organs, called glandular cells.
A noncancerous tumor occurring in glandular tissue.
Last Updated: Jan 4, 2020A condition in which endometrial tissue exists within and grows into the uterine wall.
A condition involving stiffness and pain in the shoulder joint. Also known as frozen shoulder.
A type of stress-related mental condition brought on by a life change.
A group of nonspecific symptoms such as aches, fatigue, and nervousness.
A condition where the adrenal glands don't make enough of certain hormones.
A genetic condition that damages the membrane surrounding the brain nerve cells.
A mental health condition exhibited by difficulty maintaining attention.
A disease caused by infection with the parasite Trypanosoma brucei.
A type of behavior intending to cause physical or mental harm.
Loss of the ability to identify objects or people.
Fear of places and situations that might cause panic, helplessness, or embarrassment.
A feeling of muscle quivering, restlessness, and inability to sit still, sometimes a side effect of antipsychotic or antidepressant medication.
A group of inherited disorders characterized by little or no melanin production.
A pattern of drinking that interferes with day-to-day activities.
A disturbance in behavior or mental acuity during or after alcohol consumption.
Symptoms that occur after stopping heavy drinking of alcohol.
A chronic disease including uncontrolled drinking and preoccupation with alcohol.
An allergic response causing itchy, watery eyes, sneezing, and other similar symptoms.
Swelling and irritation of the spaces inside the nose and head, also known as sinuses, due to allergies.
Last Updated: May 12, 2023Hair loss from the scalp or elsewhere, which can occur in men, women, and children.
Sudden hair loss that starts with 1 or more circular bald patches that may overlap.
Physical distress from difficulty adjusting to lower oxygen pressure at high altitude.
A painful dental condition occurring after an adult tooth is removed.
A progressive disease that destroys memory and other important mental functions.
A parasitic infection of the colon with the amoeba Entamoeba histolytica.
Last Updated: Oct 11, 2019The absence of monthly menstrual periods.
Inability to remember events for a period of time, often due to brain injury, illness, or the effects of drugs or alcohol.
The buildup of amyloid proteins in the heart, kidneys, liver or other organs.
Last Updated: Jun 24, 2023A nervous system disease that weakens muscles and impacts physical function.
A rare cancer that occurs in the short tube at the end of the rectum (anal canal).
A small tear in the lining of the anus.
An infection between the skin and the anus.
A severe, potentially life-threatening allergic reaction.
General swelling throughout the body.
Hair loss from the scalp, causing baldness.
Hormone changes in men that are related to aging.
A condition in which the blood doesn't have enough healthy red blood cells.
Low red blood cells caused by certain chronic diseases.
An underdeveloped brain and an incomplete skull.
One or more missing or extra chromosomes.
A ballooning and weakened area in an artery.
A genetic disorder causing developmental disabilities and nerve-related symptoms.
A type of chest pain caused by reduced blood flow to the heart.
Painless swelling under the skin, triggered by an allergy to animal dander, pollen, drugs, venom, food, or medication.
Inflammation and small tears in one or both corners of the mouth.
An inability to experience pleasure.
Physical discomfort in the ankle area, often including the joint or the tendon that connects the lower leg to the heel, known as the Achilles tendon.
A condition that restricts the tongue's range of motion.
An inflammatory disease that fuses spinal vertebrae together.
Last Updated: Feb 21, 2023An eating disorder causing people to obsess about weight and what they eat.
A torn anterior cruciate ligament in the knee.
A rare but serious bacterial illness.
A condition in which the immune system mistakenly attacks normal proteins in the blood.
Last Updated: Jul 22, 2023A dysfunction of a person's ways of thinking, perceiving situations, and relating to others.
A chronic mental condition that affects thinking, perceiving, and relating to others.
Intense, excessive, and persistent worry and fear about everyday situations. Fast heart rate, rapid breathing, sweating, and feeling tired may occur.
A mental condition in which excessive, ongoing worry interferes with regular activities.
A tear in the inner layer of the large blood vessel branching off the heart (aorta).
Narrowing of the valve in the large blood vessel branching off the heart (aorta).
Feeling indifferent or lacking emotion, often a sign of depression or misuse of alcohol or drugs.
A language disorder that affects a person's ability to communicate.
A rare condition in which the body stops producing enough new blood cells.
Last Updated: Jan 11, 2020A condition in which the appendix becomes inflamed and filled with pus, causing pain.
Cancer of the finger-shaped pouch attached to the colon, called the appendix.
Reduced desire to eat.
Difficulty with skilled movements even when a person has the ability and desire to do them.
Inability to perform a movement or task when asked despite having the desire and physical capability to carry it out.
Physical discomfort in any part of the arm.
A condition in which brain tissue extends into the spinal canal, present at birth.
An abnormal connection between arteries and veins, usually in the brain or spine.
Inflammation of 1 or more joints, causing pain and stiffness that can worsen with age.
Any disease of the joints.
Abdominal swelling caused by accumulation of fluid, most often related to liver disease.
A developmental disorder affecting ability to effectively socialize and communicate.
Lack of oxygen to the brain.
A lung infection caused by unintentional inhalation of food, drink, vomit, or saliva.
Eyestrain, or eye fatigue.
A condition in which a person's airways narrow and swell and produce extra mucus.
An imperfection in the eye's curvature.
Impaired balance or coordination, can be due to damage to brain, nerves, or muscles.
Complete or partial collapse of a lung or a section (lobe) of a lung.
A mass of fats, cholesterol, and other substances (plaque) in an artery.
The buildup of fats, cholesterol, and other substances in and on the artery walls.
An itchy inflammation of the skin (eczema).
An irregular, often rapid heart rate that commonly causes poor blood flow.
A condition in which the heart's upper chambers (atria) beat too quickly.
A birth defect that causes a hole in the wall between the heart's upper chambers (atria).
Wasting or degeneration of cells, tissues or organs, caused by a number of conditions.
A condition marked by hyperactivity, impulsiveness, and trouble keeping attention.
A chronic condition including attention difficulty, hyperactivity, and impulsiveness.
A lung infection (pneumonia) with atypical symptoms.
A condition that makes it hard to understand speech.
Last Updated: Dec 7, 2022Symptoms or sensations, such as flashing lights or zigzag lines, which typically precede migraine headache, seizure, or other neurological events.
A serious developmental disorder that impairs the ability to communicate and interact.
A disorder that happens when the immune system attacks the thyroid gland.
Last Updated: Mar 15, 2023The death of bone tissue due to a lack of blood supply. Avascular necrosis also is known as osteonecrosis.
A lack of the recommended blood levels of 1 or more essential vitamins.
A disorder characterized by social discomfort and avoidance of interpersonal contact.
An injury in which a body part is ripped or torn away.
A complete absence of sperm from the fluid ejaculated during orgasm (semen).
Elevated levels of certain waste products in the blood.
B
Red bumps that appear on a baby's cheeks, nose, and forehead.
Predictable periods of significant distress in an otherwise well-fed, healthy baby.
Physical discomfort occurring anywhere on the spine or back, ranging from mild to disabling.
A painful infection in a joint.
An inflammation of the vagina due to bacterial overgrowth.
A fluid-filled cyst behind the knee.
Inflammation of the foreskin and head of the penis.
Damage to the lower portion of the tube that connects the mouth and stomach (esophagus).
A fluid-filled swelling (cyst) in the Bartholin's glands, which lubricate the vagina.
A type of skin cancer that begins in the basal cells.
An invasion of a type of bug that hides in beds, biting humans to feed on their blood.
An injury caused by a bee's venom.
A rare disorder causing swelling, also called inflammation, in blood vessels.
Sudden weakness in the muscles on 1 side of the face.
A common reason for a sudden feeling of spinning or of the world spinning.
Last Updated: Nov 9, 2022Age-associated prostate gland enlargement that can cause urination difficulty.
A condition in which the body doesn't have enough vitamin B-1, also called thiamin.
Last Updated: Jun 10, 2023A type of inherited blood disorder.
When the aortic valve has 2 flaps instead of 3.
Pain that occurs when a gallstone is being passed and is blocking a bile duct, typically comes and goes in a fairly regular pattern.
Frequently consuming unusually large amounts of food in one sitting and feeling that eating behavior is out of control.
A type of bipolar disorder characterized by depressive and hypomanic episodes.
A disorder associated with mood swings ranging from depressive lows to manic highs.
A condition in children marked by intense mood swings.
Bird flu is a type of flu that rarely infects humans, but when it does, it's often deadly.
A skin abnormality that’s present when, or develops soon after, a baby is born.
A condition caused by bleeding under the skin around the eye, often resulting from an injury.
An open pore clogged with oil, which has turned brown when exposed to the air.
Temporary loss of vision and consciousness.
Cancer that begins in the bladder.
The release of blood from a broken blood vessel, either inside or outside the body.
Inflamed, irritated gums that bleed easily.
An inflammation of the eyelid that affects the eyelashes or tear production.
Occurs when a gestational sac develops without an embryo.
Complete or partial loss of vision.
An area of skin covered by a raised, fluid-filled bubble.
Last Updated: Sep 23, 2023A buildup of gas in the stomach and intestines.
A bump on the skin that's filled with blood.
Blood can appear with bowel movements because of irritation, constipation, hemorrhoids, digestive conditions, or colon cancer.
Any type of disease that spreads through exposure to human blood.
Multiple bluish or purplish marks on a baby’s skin due to formation of blood cell clusters.
Decreased clarity or sharpness in vision.
A mental illness involving obsessive focus on a perceived flaw in appearance.
A condition in which tiny insects infest the skin.
Odor caused by the combination of sweat and bacteria normally found on the skin.
Any condition or disease that affects the bones.
A complete or partial break in a bone.
When the body doesn't replace bone as fast as it breaks bone down.
A condition that occurs when cancer cells spread from their original site to a bone.
A bony growth that develops on the edge of a bone, sometimes causing symptoms.
A mass of unusual cells growing in a bone. Bone tumors may be cancerous or noncancerous.
A mental disorder marked by emotional instability and severely distorted self-image.
The state of feeling disinterested in one's surroundings, having nothing to do, or feeling that life is dull.
A rare poisoning caused by toxins produced by Clostridium botulinum bacteria.
A brain disorder in adult cattle that may be spread to humans through diseased meat.
Slower-than-expected heart rate, generally beating fewer than 60 beats per minute.
The destruction or deterioration of brain cells.
A condition in which there's no measurable activity in the brain and brainstem.
An emergency condition in which a ruptured blood vessel causes bleeding in the brain.
A cancerous or noncancerous mass or growth of abnormal cells in the brain.
A cancer that forms in the cells of the breasts.
A fluid-filled sac in the breast, which usually isn't cancerous.
A growth that forms within the breast tissue.
Tightness, tenderness or sharp pain in one or both breasts that occurs commonly and usually doesn't mean anything serious is wrong.
A break in the bone connecting the breastbone and shoulder. This also is known as a clavicle fracture.
A broken bone in the nose. This is also called a nasal fracture.
A condition in which the lungs' airways become damaged, making it hard to clear mucus.
An inflammatory bronchial reaction in young children and infants.
Inflammation of the lining of bronchial tubes, which carry air to and from the lungs.
An infection spread from animals to people, mostly by unpasteurized dairy products.
A potentially life-threatening heart rhythm disorder.
Blood or bleeding under the skin due to trauma of any kind; typically black and blue at first, with color changes as the bruise heals.
Grinding, clenching, or gnashing of the teeth.
A rare but serious bacterial infection that's transmitted by fleas.
A serious eating disorder marked by binging, followed by methods to avoid weight gain.
A rare skin condition causing large, fluid-filled blisters.
A bony bump that forms on the joint at the base of the big toe.
Last Updated: Oct 22, 2019A fast-growing cancer of the body's lymphatic system.
Damage to the skin or deeper tissues caused by sun, fire, electricity, or chemicals.
The sensation of painful, burning feet.
Ongoing or recurrent burning in the mouth with no obvious cause.
Painful swelling of the fluid-filled pads, called bursae, that act as cushions at the joints.
Last Updated: Jun 24, 2023A bacterial infection of the skin and soft tissue.
C
Weight loss and muscle wasting that can’t be reversed simply by consuming more calories.
A general state of ill health involving great weight loss and muscle loss.
Thickened layers of skin, often on the hands or feet.
A fungal infection typically on the skin or mucous membranes caused by candida.
A small, shallow sore inside the mouth or at the base of the gums.
An illness caused by breathing in too much of this deadly gas.
Last Updated: Apr 6, 2023A group of pus-filled bumps forming a connected area of infection under the skin.
A type of slow-growing cancer that can arise in several places throughout the body.
A slow-growing cancerous tumor that can grow in several places throughout the body.
A cancer developing from cells that line the skin or inner organs, called epithelial cells.
Sudden, unexpected loss of heart function, breathing, and consciousness.
Improper beating of the heart, whether irregular, too fast, or too slow.
Compression of the heart caused by fluid collecting in the sac surrounding the heart.
A condition in which the heart suddenly can't pump enough blood.
An enlarged heart, which is usually a sign of another condition.
A condition of abnormal heart muscle, such as enlarged chambers or thickened walls.
A numbness and tingling in the hand and arm caused by a pinched nerve in the wrist.
An infection of the lymph nodes caused by a scratch or bite from a cat.
Last Updated: Mar 17, 2020Clouding of the normally clear lens of the eye.
A buildup of mucus in the nose, head and throat.
Last Updated: May 4, 2023A group of movement abnormalities associated with mental illness.
A serious condition in which the nerves at the end of the spinal cord are compressed.
A deformity of the outer ear that may occur after injury to the ear.
An immune reaction to eating gluten, a protein found in wheat, barley, and rye.
Lumpy, dimpled flesh on thighs, hips, buttocks, and belly.
A common and sometimes serious bacterial skin infection.
Swelling of the brain.
A disorder of movement, muscle tone, or posture.
Cancer of the cervix, the lower part of the uterus connected to the vagina.
The development of abnormal cells in the narrow neck of a woman's uterus (the cervix).
Swelling of the cervix, the lower end of the womb that opens into the vagina.
Last Updated: Feb 21, 2023An infectious disease caused by a parasite found in the feces of the triatomine bug.
A slow-growing, inflammatory lump in the tear gland of the eyelid.
A group of hereditary disorders that damage the nerves in the arms and legs.
A sudden, involuntary contraction of one or more muscles (cramp), often in the legs.
Inflammation of the lips.
Damage to the skin and deeper tissues caused by chemical contact.
A common, noncancerous skin growth.
An infection of the lungs or airways (bronchi).
Discomfort in the chest including a dull ache, a crushing or burning feeling, a sharp stabbing pain, and pain that radiates to the neck or shoulder.
A highly contagious viral infection causing an itchy, blister-like rash on the skin.
A viral infection from a mosquito bite.
Skin sores or bumps that happen after exposure to very cold temperatures.
A condition in which a child weighs well above the typical weight for age and height.
Last Updated: Jun 27, 2023The feeling of being cold, though not necessarily in a cold environment, often accompanied by shivering.
A common sexually transmitted infection that may not cause symptoms.
When a person can't breathe due to a blocked airway.
Last Updated: Nov 5, 2022A cancer in the slender tubes that carry the digestive fluid bile through the liver.
Infection of the common bile duct.
Inflammation of the gallbladder, a small, digestive organ beneath the liver.
A bacterial disease causing severe diarrhea and dehydration, usually spread in water.
Any condition in which the flow of bile from the liver stops or slows.
A cyst in the middle ear.
Damage to the cartilage under the kneecap.
A type of cancer of the uterus that spreads rapidly.
Extreme fatigue that can't be explained by an underlying medical condition.
A condition that causes increasing weakness in the legs and arms.
A type of cancer of the blood and bone marrow.
A slowly progressing, uncommon type of blood cell cancer that begins in bone marrow.
A group of lung diseases that block airflow and make it difficult to breathe.
Persistent pain that lasts weeks to years.
Long-term inflammation of the pancreas.
The gradual loss of kidney function.
A long-term condition in which leg veins don't properly return blood to the heart.
Scarring of the liver caused by a liver disease or condition.
Pain, commonly in the legs, caused by too little blood flow, usually during exercise. Often indicates peripheral artery disease.
Openings or splits in the roof of the mouth.
Inflammation of the colon caused by the bacteria Clostridium difficile.
A common birth defect in which the foot is twisted out of shape or position.
A rare condition in which headaches occur in patterns or clusters.
A condition in which the blood doesn't clot properly.
A narrowing of the large blood vessel (aorta) that leads from the heart.
An infection with the fungus coccidioides, sometimes called valley fever.
Pain in or around the bony structure at the bottom of the spine, called the tailbone or coccyx.
Inflammation of the large intestine.
Last Updated: Jan 4, 2020A common break of the wrist.
Last Updated: Jan 25, 2023A reduced ability to distinguish between certain colors.
A cancer of the colon or rectum, which may begin as noncancerous polyps.
Last Updated: Jun 30, 2022A period of prolonged unconsciousness brought on by illness or injury.
An open (blackhead) or closed (whitehead) skin pore or hair follicle clogged with oil, dead skin cells, and bacteria.
A common viral infection of the nose and throat.
A common type of pneumonia that occurs outside of health care facilities.
Too much pressure in the tissue compartments that separate muscle groups.
Chronic arm or leg pain developing after injury, surgery, stroke, or heart attack.
Thoughts, urges, or behaviors that persist despite negatively affecting health, job, or relationships.
A persistent difficulty discarding or parting with possessions because of a perceived need to save them.
Brain injury caused by a blow to the head or a violent shaking of the head and body.
A group of emotional and behavioral conditions in children and teens.
Trouble hearing that happens when sound can't fully reach the inner ear.
Last Updated: Mar 31, 2023A group of conditions passed from parent to child that limits the making of hormones in the adrenal glands.
Last Updated: Apr 12, 2023An abnormality in the heart that develops before birth.
A condition that occurs in a baby whose mother is infected with the rubella virus.
Two babies born physically connected to each other.
Inflammation or infection of the outer membrane of the eyeball and the inner eyelid.
A group of disorders involving the connective tissue.
Infrequent bowel movements, and small, hard-to-pass, stool.
A skin rash caused by contact with a substance.
Tightening or shortening of muscle, commonly in reference to uterine contractions during childbirth.
A condition in which emotional stress is converted to physical symptoms.
A loss of consciousness accompanied by violent muscle contractions.
Thick, hardened layers of skin caused by friction and pressure.
A scratch or cut on the cornea.
Damage to or disease in the heart's major blood vessels.
A disease caused by infection with a virus that can cause respiratory illness. The virus belongs to the family of viruses that cause the common cold and severe acute respiratory syndrome (SARS).
Last Updated: Apr 4, 2020A rare disease in which areas of the brain shrink and nerve cells die, affecting how you move and think.
Last Updated: Feb 22, 2022An inflammation of the cartilage that connects a rib to the breastbone.
A sudden, forceful hacking sound to release air and clear an irritation in the throat or airway.
Crusting and white or yellow scales on a baby's scalp.
A painful, involuntary contraction of a muscle.
A birth condition in which 1 or more joints in a baby's skull close too soon.
Crackling or grating sound caused by joint surfaces rubbing against each other.
A degenerative brain disorder that leads to dementia and death.
A chronic inflammatory bowel disease that affects the lining of the digestive tract.
An upper airway infection that blocks breathing and has a distinctive barking cough.
Shedding tears in response to certain emotions or pain.
A testicle that hasn't moved into the bag of skin below the penis before birth.
Cushing syndrome happens when, over time, the body has too much of the hormone cortisol.
Last Updated: Mar 14, 2023A disease caused by infection with leishmania parasites.
Last Updated: Dec 10, 2019Blue or gray color of the skin, nails, lips, tongue or gums
Last Updated: May 25, 2023A mood disorder that causes emotional highs and lows.
An abnormal, usually noncancerous growth filled with liquid or a semisolid substance, sometimes causing pain.
An inherited life-threatening disorder that damages the lungs and digestive system.
A tapeworm infection that affects the brain, muscle and other tissues.
A bulge of the bladder into the vagina.
D
An abnormal immune system response to milk and milk products.
A congenital brain condition affecting the part of the brain controlling movement.
A painful condition affecting the tendons on the thumb side of the wrist.
Complete or almost-complete loss of hearing.
A blood clot in a deep vein, usually in the legs.
Distortion or disfigurement of any part of the body.
Osteoarthritis of the spine, usually in the neck or lower back.
A significant loss of body fluid that impairs normal body functions.
Serious disturbance in mental abilities that results in confused thinking and reduced awareness of surroundings.
Severe alcohol withdrawal symptoms such as shaking, confusion, and hallucinations.
A belief or altered reality that is persistently held despite evidence or agreement to the contrary, generally in reference to a mental disorder.
A group of thinking and social symptoms that interferes with daily functioning.
Any condition that damages the sheath that protects the brain and spinal nerves.
A mosquito-borne disease occurring in tropical and subtropical areas.
A pocket of pus in a tooth caused by an infection.
Permanently damaged areas in teeth that develop into tiny holes (cavities).
A sticky film that coats teeth and contains bacteria.
The persistent feeling of observing oneself from outside one’s body or having a sense that one’s surroundings aren't real.
A persistent feeling of sadness and loss of interest.
Inflammation of the skin with many causes and forms, often causing itching and a rash.
A chronic, very itchy skin rash made up of bumps and blisters.
A condition in which scratching the skin causes raised, hive-like lines.
An inflammatory disease marked by muscle weakness and skin rash.
A small, noncancerous lump (cyst) in the skin, often near the eye, present at birth.
An unintended damage to and loss of the upper layer of skin.
A childhood developmental disorder marked by clumsiness in otherwise healthy kids.
A disorder caused by a defect in chromosome 22.
A disease that causes the body to make large amounts of urine and can lead to extreme thirst.
Last Updated: Mar 7, 2023A group of diseases that can cause high blood sugar.
Last Updated: Mar 7, 2023A diabetic foot ulcer is an open sore or wound on the foot in people who have diabetes.
A serious diabetes complication in which the body makes too much of the blood acids called ketones.
A type of nerve damage that can happen with diabetes.
A complication of diabetes that affects the eyes.
Loose, watery stools that occur more frequently than usual.
Loose, watery bowel movements that may occur frequently and with a sense of urgency.
A condition in which the large abdominal muscles separate during pregnancy.
Managing consumption of food and drink with the intent to lose, gain, or maintain weight.
A common, fast-growing form of cancer of the lymph glands or nodes.
Last Updated: Sep 25, 2021A disease of the heart muscle, primarily affecting the left ventricle.
A serious infection of the nose and throat.
Seeing two images of an object, also known as double vision.
An injury in which the upper arm bone comes out of the shoulder blade socket.
An injury in which the hipbone is displaced from its normal position.
Condition affecting the blood's ability to clot and stop bleeding.
Disconnection and lack of continuity between thoughts, memories, surroundings, actions, and identity.
A disorder characterized by the presence of 2 or more distinct personality states.
A common condition in which one of the long bones near the wrist breaks.
An inflammation or infection in 1 or more small pouches in the digestive tract.
A condition in which small, bulging pouches develop in the digestive tract.
A sac that develops in the lining of the bowel or bladder.
A range of sensations that can include feeling faint, woozy, weak, unsteady or a sense of spinning.
Bites from a pet or wild dog.
A genetic chromosome 21 disorder causing developmental and intellectual delays.
A parasitic infection occurring in parts of Africa without access to safe water.
Last Updated: Dec 18, 2019The flow of saliva outside the mouth.
Death caused by suffocation when water or other liquid fills the lungs.
Physical and mental symptoms that occur after stopping or reducing intake of a drug.
Decreased moisture in the body.
An inherited disorder of progressive muscular weakness, typically in boys.
A type of breast cancer that starts in a milk duct of the breast.
A gradual thickening and tightening of tissue under the skin in the hand.
Short height that results from a genetic or medical condition.
Weakness in the muscles used for speech, which often causes slowed or slurred speech.
A dysfunction of the nerves that regulate nonvoluntary body functions, such as heart rate, blood pressure, and sweating.
Inflammation of the intestines along with bloody diarrhea.
An altered or impaired sense of taste.
A condition in which tiny, fluid-filled blisters appear on the palms and fingers.
A condition in which tiny, fluid-filled blisters appear on the palms and fingers.
Uncontrolled, involuntary muscle movement.
A learning disorder characterized by difficulty reading.
An elevated level of cholesterol or fats, known as lipids, in the blood.
Cramps and pelvic pain with menstruation, with common causes such as heavy flow, passing clots, uterine fibroids, or endometriosis.
Genital pain that happens just before, during or after sex.
Last Updated: Feb 25, 2023Difficulty swallowing foods or liquids, arising from the throat or esophagus, ranging from mild difficulty to complete and painful blockage.
Difficulty speaking or using words properly.
A change in how the voice sounds. Dysphonia affects the ability to talk or sing.
A state of feeling uneasy, unhappy, or unwell.
Shortness of breath.
A mild but long-term form of depression.
Involuntary muscle contractions that cause repetitive or twisting movements.
The medical term for pain while passing urine, which can have many treatable causes.
Last Updated: May 20, 2023E
Pain in the inner or outer ear that might decrease hearing, often caused by fluid buildup and infection.
Last Updated: May 12, 2023A virus that causes severe bleeding, organ failure, and can lead to death.
A large, blue or purple bruise under the skin that changes color over time before fading.
Seizures in a pregnant woman or in a woman shortly after childbirth.
A pregnancy in which the fertilized egg implants outside the uterus.
Last Updated: Feb 25, 2023Excess fluid trapped in soft tissue, most noticeably occurs in the hands, ankles, and feet.
A condition that causes severe developmental delays due to an extra chromosome 18.
A common allergy in which the body reacts to the consumption of eggs.
A group of illnesses passed from parent to child, known as inherited, that affect the skin, joints and blood vessels.
Last Updated: Jan 31, 2023Physical discomfort in the elbow joint, or in the muscles, tendons, and ligaments supporting it.
Injury to the body from direct contact with a high-voltage source.
Swelling of the limbs caused by a blockage in the lymphatic system.
The state of being excessively thin and wasted.
A blockage of blood supply to part of the brain caused by a clot or debris (embolus).
A sudden blocking of an artery.
Inflammation of the brain, often due to infection.
A broad term for any brain disease that alters brain function or structure.
A condition in which a child resists having bowel movements, causing impacted stool to collect in the colon and rectum and lead to leakage.
An infection of the heart's inner lining, usually involving the heart valves.
A type of cancer that begins in the lining of the womb (uterus).
A usually noncancerous growth attached to the inner wall of the womb (uterus).
A disorder in which tissue similar to the tissue that lines the uterus grows outside the uterus in places where it doesn't belong.
Last Updated: Aug 31, 2022Loss of bladder control.
A high level of disease-fighting white blood cells known as eosinophils in the blood.
Inflammation or injury to the tube connecting the mouth to the stomach.
Clusters of pigment cells in the skin, also known as freckles.
A noncancerous small bump beneath the skin.
A group of conditions in which injury, heat, or friction makes the skin blister.
Inflammation of the tube at the back of the testicle that stores and carries sperm.
An accumulation of blood between the skull and brain.
A dangerous condition that happens when the small flap that covers the windpipe swells and blocks airflow into the lungs.
Last Updated: Feb 21, 2023A disorder in which nerve cell activity in the brain is disturbed, causing seizures.
Occurs when a man can't get or keep an erection firm enough for sexual intercourse.
Excess gas in the stomach or upper intestine released from the mouth, also known as burping or belching.
A skin infection that occurs mainly on the face and legs.
Redness of the skin, either in a limited area or all over.
A skin condition mostly due to an infection.
A painful disorder characterized by tender bumps (nodules) under the skin.
Fear of the color red, often accompanied by fear of blood or blushing.
Dead tissue that eventually sloughs off healthy skin after an injury.
Last Updated: Feb 29, 2020Cancer of the tube that runs from the throat to the stomach (esophagus).
Abnormal veins in the lower part of the tube running from the throat to the stomach.
Inflammation that damages the tube running from the throat to the stomach (esophagus).
A nervous system disorder that causes rhythmic shaking.
An extreme, unrealistic feeling of physical and emotional well-being, feeling "high."
A cancer that most often occurs in and around the bones.
A widely spread out rash.
Bulging of the eyes, which causes the eyes to move out of the sockets in one or both eyes.
Fluid that has leaked out of blood vessels into or on nearby tissues.
Physical discomfort in the eye's surface or deep within the eye, ranging from a slight irritation to severe pain.
Involuntary spasms of the eyelid muscles.
F
Inherited blood-clotting disorder due to a mutation of the blood's factor V protein.
A condition in which a woman who isn't pregnant believes that she is.
A vision condition in which objects far away are seen more clearly than objects close up.
Involuntary twitching of voluntary muscles.
Feeling overtired, with low energy and a strong desire to sleep that interferes with normal daily activities.
An increased buildup of fat in the liver.
An unpleasant feeling triggered by the perception of danger, real or imagined.
Convulsion in a child that may be caused by a spike in body temperature (fever).
Hardened stool that's stuck in the rectum or lower colon due to chronic constipation.
Physical and mental damage in a child due to alcohol exposure while in the womb.
A short-term rise in body temperature that's often caused by an infection.
A prolonged fever without an established cause despite testing.
A noncancerous breast tumor that most often occurs in young women.
Noncancerous changes that give a breast a lumpy or ropelike texture.
A noncancerous tumor made up of fibrous or connective tissue.
A widespread muscle and bone pain and tenderness.
The formation of fibrous tissue.
A formation of fibrous tissues.
A common and highly contagious childhood ailment causing a distinctive face rash.
Last Updated: Apr 15, 2020Infection with a parasite called a filarial worm.
A pregnancy in the first three months.
Last Updated: Mar 19, 2022A dry, sore, irritated, or cracked nipple.
An abnormal connection between organs.
Loose and floppy limbs.
A condition in which the entire sole of the foot touches the floor when standing.
Intestinal gas that’s passed from the anus.
Spots in vision that look like black or gray specks or strings that drift across the eyes.
Reddening of the skin.
A slow-growing form of non-Hodgkin's lymphoma.
Last Updated: Sep 25, 2021Infection of 1 or more of the pockets from which hair grows (follicles).
An unpleasant or dangerous immune system reaction after a certain food is eaten.
An intense desire for certain foods or flavors.
Digestive problems that occur after a certain food is eaten.
Illness caused by food contaminated with bacteria, viruses, parasites, or toxins.
Parasitic worm infections that cause severe liver and lung disease.
A general term for difficulty lifting the front part of the foot, sometimes called drop foot.
Physical discomfort in the foot.
Last Updated: May 12, 2023A genetic condition causing intellectual disability.
The need to urinate more often than normal.
Sweating and flushing of a patch of skin near one ear caused by eating.
Last Updated: Feb 28, 2023A condition in which skin and the tissue just below the skin freeze.
A painful, pus-filled bump under the skin caused by infected, inflamed hair follicles.
G
A condition causing red blood cells to break down during stress or infection.
A condition in which the body can't use a simple sugar to produce energy.
Conditions affecting the gallbladder, a small organ that helps digestion.
A hardened deposit of fluid in the gallbladder, a small organ under the liver.
A noncancerous lump, often on the tendons or joints of the wrists and hands.
Last Updated: May 12, 2023Dead tissue caused by an infection or lack of blood flow.
Symptoms that occur when undigested stomach contents move into the small bowel.
Any of a group of conditions in which the stomach lining is inflamed.
An intestinal infection marked by diarrhea, cramps, nausea, vomiting, and fever.
Digestive disease in which stomach acid or bile irritates the food pipe lining.
A condition in which a hole develops in a digestive organ or tract.
A digestive tract tumor that most often occurs in the stomach or small intestine.
A condition that affects the stomach muscles and prevents proper stomach emptying.
A condition in which part of a newborn's intestines sticks out of the belly at birth.
An inherited condition in which an enzyme that breaks down fat doesn't work properly.
Severe, ongoing anxiety that interferes with daily activities.
A common sexually transmitted infection marked by genital pain and sores.
A small bump on the genitals caused by a common sexually transmitted infection.
A condition in which the knees stay apart even when standing with feet and ankles together, also known as bowlegs.
A condition that causes harmless tongue patches resembling smooth, red islands.
A condition that causes high blood sugar during pregnancy.
Last Updated: Apr 8, 2023An intestinal infection caused by a giardia parasite.
A rare condition that causes irregular growth and other symptoms in children.
A mild condition in which the liver doesn't properly process bilirubin.
A form of gum disease that causes inflamed gums.
A group of eye conditions that can cause blindness.
A malignant tumor affecting the brain or spine.
A type of tumor that occurs in the brain and spinal cord.
The feeling of having a lump or ball in the throat.
Inflammation of the tiny filters in the kidneys that remove waste from blood.
A condition in which the tongue swells, changes color, and looks smooth.
Ongoing or recurrent burning in the mouth with no obvious cause.
Sensitivity to gluten, a protein found in wheat, barley, and rye.
A goiter is the irregular growth of the thyroid gland.
Last Updated: Mar 14, 2023A condition that causes pain on the inner side of the elbow.
A sexually transmitted bacterial infection that, if untreated, may cause infertility.
A form of arthritis characterized by severe pain, redness, and tenderness in joints.
A condition that occurs when donor bone marrow or stem cells attack the recipient.
A seizure that involves a loss of consciousness and violent muscle contractions.
A small area of inflammation in tissue.
Ring-patterned red or skin-colored bumps usually on the hands and feet.
A condition that causes inflammation of the blood vessels.
A disorder of the immune system that causes the thyroid gland to make too much thyroid hormone.
Last Updated: Mar 14, 2023Strep throat, scarlet fever and related infections caused by group A streptococcus.
Last Updated: Dec 18, 2019An infection caused by a common bacterium (group B streptococcus).
Soreness in a child's legs that often occurs at night.
A condition in which the immune system attacks the nerves.
Feeling responsible or regretful for a perceived offense, real or imaginary.
A skin condition of tiny, drop-shaped sores on trunk, arms, legs, and scalp.
Swollen male breast tissue caused by a hormone imbalance.
Last Updated: Oct 2, 2019H
A serious complication of high blood pressure during pregnancy.
AIDS is a chronic immune system disease caused by the human immunodeficiency virus (HIV).
Last Updated: Aug 30, 2022Progressive loss of hair from the scalp beyond normal hair loss of less than 100 hair strands a day.
A temporary condition in which the tongue appears dark and furry.
A persistent, unpleasant odor in exhaled breath, usually not serious, commonly called bad breath.
A perception of having seen, heard, touched, tasted, or smelled something that wasn't actually there.
A noncancerous tumorlike growth.
A foot condition in which the toe has an abnormal bend in the middle joint.
A common children's virus that causes sores in the mouth and a rash on the hands and feet.
Unpleasant symptoms that occur after excessive alcohol intake.
A group of viruses carried by rodents that can cause serious disease.
A condition in which a newborn has hard, thick skin in diamond patterns.
A disorder that happens when the immune system attacks the thyroid gland.
Last Updated: Mar 15, 2023A group of cancers of the mouth, sinuses, nose, or throat.
A condition in which tiny insects infest the scalp.
A painful sensation in any part of the head, ranging from sharp to dull, that may occur with other symptoms.
Trouble hearing in one or both ears that can get worse over time.
Last Updated: May 27, 2023A chronic condition in which the heart doesn't pump blood as well as it should.
Sound of blood flowing through the heart, due to anything from healthy heart exertion during exercise to a diseased heart valve or other abnormality.
Any condition that prevents 1 or more heart valves from working properly.
Burning pain or discomfort in the upper chest and midchest, possibly involving the neck and throat, that may worsen when lying down.
Soreness on the back or the underside of the heel that may make walking uncomfortable or difficult.
Last Updated: May 12, 2023A bony growth that develops around the heel bone, sometimes causing pain.
A birthmark often appearing as a rubbery, bright red nodule of extra blood vessels.
Vomiting blood.
Bright red blood in the stool or with bowel movements.
A collection of blood in an organ or tissue, usually from a ruptured blood vessel.
Blood in semen.
Blood in the urine may range from very obvious to microscopic and not visible at all.
Muscle weakness or partial paralysis on one side of the body that can affect the arms, legs, and facial muscles.
The breakdown of red blood cells.
A condition in which red blood cells are destroyed faster than the body makes them.
A condition in which a newborn's blood is damaged by antibodies from the mother.
A condition in which a buildup of white blood cells harms the liver and spleen.
A disorder in which blood doesn't clot normally.
Coughing up blood, in small amounts mixed with sputum brought up by a forceful cough or large amounts of bright red blood, which is more serious.
Internal or external bleeding that may occur anywhere, and depending on the location, may range from a bruise to a life-threatening brain bleed.
Any of a group of infectious diseases that interfere with the blood's ability to clot.
Swollen and inflamed veins in the rectum and anus that cause discomfort and bleeding.
A disorder causing inflammation and bleeding in the small blood vessels.
The loss of brain function when a damaged liver doesn't remove toxins from the blood.
An inflammation of the liver.
A highly contagious liver infection caused by the hepatitis A virus.
A serious liver infection caused by the hepatitis B virus.
An infection caused by a virus that attacks the liver and leads to inflammation.
The most common form of liver cancer.
An enlarged liver.
A bulging of an organ or tissue through an abnormal opening, typically in the belly.
A common childhood illness often caused by group A coxsackie viruses.
Infection with the herpes simplex virus around the border of the lips (oral herpes).
A virus causing contagious sores most often around the mouth or on the genitals.
A reactivation of the chickenpox virus in the body, causing a painful rash (shingles).
A condition in which the colored part of the eye (iris) is multicolored.
A condition in which part of the stomach pushes up through the diaphragm muscle.
Involuntary spasms of the diaphragm, usually short-lived and not a sign of something serious.
A chronic skin condition featuring lumps in places such as the armpits or groin.
A mild version of a developmental condition affecting a child's ability to interact.
An injury that causes the hipbone to move out of place.
Last Updated: Jun 20, 2023A break in the upper quarter of the thighbone, near the hip joint.
Last Updated: Aug 4, 2023Pain on the inside or outside the hip, which can be caused by arthritis, injuries or other health problems.
Swelling of the tissues, called tendons, that connect muscle to the bone in the hip joint.
A condition of the large intestine (colon) that causes difficulty passing stool.
Unwanted male-pattern hair growth on a woman's face, chest, and back.
A chronic mental condition that affects thinking, perceiving, and relating to others.
Welts on the skin triggered by a reaction to food, medicine, or other irritants.
Cancer of the part of the immune system called the lymphatic system.
Symptoms of a disrupted nerve pathway from the brain to the face and eye on one side.
Feelings of opposition, unkindness, or unfriendliness toward something or someone.
Sudden feeling of warmth, usually most intense over the face, neck, and chest, and profuse sweating, commonly due to menopause.
An infection that causes warts in various parts of the body, depending on the strain.
A break in the upper arm bone, known as the humerus.
Last Updated: Jan 28, 2023An increased appetite or craving for food.
An inherited condition in which nerve cells in the brain break down over time.
A tapeworm infection that affects the liver, lungs, brain and other organs.
A fluid-filled sac around a testicle, often first noticed as swelling of the scrotum.
A buildup of fluid in the cavities deep within the brain.
Swelling in a kidney due to a backup of urine.
Last Updated: Jan 3, 2020A serious condition in which extra fluid builds up inside a fetus or newborn.
Too much calcium in the blood.
Last Updated: Mar 31, 2020High amounts of the waxy substance found in fats in the blood, known as cholesterol.
Last Updated: Aug 10, 2023Extra teeth in the mouth.
A severe type of nausea during pregnancy.
Last Updated: Oct 22, 2019Increased blood flow to a part of the body.
High blood sugar levels.
Abnormally excessive sweating involving the extremities, underarms, and face, usually unrelated to body temperature or exercise.
A high level of the electrolyte potassium in the blood. Potassium is a chemical that is important to the function of nerve and muscle cells, including those in the heart.
Last Updated: Jun 22, 2023A condition in which there are high levels of fat-like substances (lipids) in the blood.
When one or more joints can move through a wider range of motion than is usual.
A high level of sodium in the blood.
An excess of the hormone made by 4 small glands in the neck (parathyroid glands).
Darkened patches or spots on the skin.
An abnormal increase in normal cell production.
An obsession with sexual thoughts, urges, or behaviors that may cause distress or that negatively affects health, job, or relationships.
Excessive sleepiness or drowsiness.
A condition in which the force of the blood against the artery walls is too high.
A severe increase in blood pressure that can lead to a stroke.
A dangerously overheated body, usually in response to prolonged, hot, humid weather.
Last Updated: Jan 4, 2020A condition in which the thyroid gland makes too many hormones.
A high level of a certain type of fat, known as triglycerides, in the blood.
A condition in which the heart muscle becomes abnormally thick.
The enlargement of an organ.
A high level of uric acid in the blood. This can be linked to gout or kidney stones.
Rapid or deep breathing.
A condition in which the liquid portion of the blood (plasma) is too high.
A condition in which the blood has too little calcium.
Obsession with the idea of having a serious but undiagnosed medical condition.
A decreased sense of touch or sensation, also called numbness.
A condition in which the body's blood sugar level goes below the standard range.
A failure of the gonads, testes in men and ovaries in women, to function properly.
A low level of the electrolyte potassium in the blood. Potassium is important to the proper functioning of nerve and muscles cells, particularly heart muscle cells.
Last Updated: Jun 24, 2023Slowed or reduced muscle movement.
A condition that occurs when the level of sodium in the blood is too low.
A condition in which the left side of the heart is underdeveloped at birth.
A condition in which the opening that drains urine is on the underside of the penis.
Low blood pressure, which can cause fainting or dizziness because the brain doesn't receive enough blood.
When the body loses heat faster than it can produce heat, causing a dangerously low body temperature.
A condition in which the thyroid gland doesn't make enough thyroid hormones.
Weak muscle tone.
Too little vitamin D in the body.
A condition in which the liquid portion of the blood (plasma) is too low.
A low level of oxygen in the blood.
An absence of enough oxygen in the blood to sustain bodily functions.
I
The creation of additional problems or complications resulting from medical treatment.
Last Updated: Jan 4, 2020A group of skin disorders characterized by dry, scaly, or thickened skin.
Last Updated: Jul 31, 2020Low levels of the blood cells that prevent bleeding, called platelets.
Inability of the intestine (bowel) to contract normally and move waste out of the body.
A painful knee condition in which connective tissue rubs against the thighbone.
Yellow tint of the skin due to high levels of a substance called bilirubin, with causes ranging from gallstones to cancer of the liver or pancreas.
Last Updated: Feb 28, 2020A highly contagious skin infection that causes red sores on the face.
Shoulder pain caused by connective tissue (a tendon) rubbing on a shoulder blade.
A problem with emotional or behavioral self-control.
A group of conditions in which the body can't properly convert food into energy.
Upper abdominal discomfort, described as burning sensation, bloating or gassiness, nausea, or feeling full too quickly after starting to eat.
A yellow tint to the skin in newborns due to temporarily elevated bilirubin levels, a condition that must be carefully monitored.
Tissue death from reduced blood supply.
Often called mono or kissing disease, an infection with the Epstein-Barr virus.
Not getting pregnant despite having frequent, unprotected sex for 1 year.
An immune response that causes redness and swelling of an area on the body or possibly tissues within the body.
Last Updated: Mar 4, 2020Ongoing inflammation of all or part of the digestive tract.
A rare, rapidly developing cancer that makes the breast red, swollen, and tender.
A common, sometimes deadly viral infection of the nose, throat and lungs, also called flu.
A shaved or tweezed hair that grows back into the skin, causing inflammation.
A condition in which soft tissue bulges through a weak point in the abdominal muscles.
The bite of an insect, such as a bee or mosquito, which usually causes mild symptoms.
Persistent problems falling or staying asleep or both.
A resistance to the hormone insulin, resulting in increasing blood sugar.
Last Updated: Feb 6, 2020Below average intelligence and set of life skills present before age 18.
Bleeding inside the body, particularly in the chest or belly cavities, or into muscles.
Interstitial cystitis is a chronic, painful bladder condition.
A group of disorders that cause progressive scarring of lung tissue.
Skin inflammation, usually in warm, moist areas, such as the groin or between skin folds.
Last Updated: Jul 31, 2020A weakness in a blood vessel in the brain that balloons and fills with blood.
A condition in which a baby does not grow to normal weight during pregnancy.
A condition in which part of the intestine slides into an adjacent part of the intestine.
A nipple that's turned inward.
A lack of iodine in the diet.
A condition of too little iron in the body.
Last Updated: Oct 22, 2019Too few healthy red blood cells due to too little iron in the body.
Last Updated: Oct 22, 2019Too much iron in the body.
Last Updated: Jul 22, 2023Missed, delayed, or inconsistent periods or menstrual bleeding patterns that are out of the ordinary.
Feelings of frustration or anger, often over seemingly small matters.
An intestinal disorder causing pain in the belly, gas, diarrhea, and constipation.
A patchwork of inflamed, bright red skin on a baby's bottom (diaper rash).
Reduced blood flow.
A persistent and often intense itch around the anus.
J
An infection found in Asia and the West Pacific that can cause brain swelling.
Last Updated: May 20, 2020Yellow skin caused by the buildup of bilirubin in the blood.
A yellow tint to the skin or eyes caused by an excess of bilirubin, a substance created when red blood cells break down.
Physical discomfort in the jaw.
A sleep disorder that can affect those who travel quickly across multiple time zones.
An injury where bone joints are forced out of their usual position.
Physical discomfort where two or more bones meet to form a joint, ranging from mild to disabling.
A form of arthritis that affects children.
K
A cancer that causes lesions in the soft tissues.
A condition that causes inflammation in the walls of some blood vessels in the body.
A raised scar after an injury has healed.
Inflammation of the clear tissue on the front of the eye (cornea).
Dry eye that occurs when tears aren't able to provide adequate moisture.
A condition in which the clear tissue on the front of the eye (cornea) bulges outward.
A condition that causes rough patches and small, acnelike bumps on the skin.
Life-threatening disturbance of metabolism most often seen in uncontrolled diabetes.
Pain that starts in the pair of organs located in the back below the ribs.
A small, hard deposit that forms in the kidneys and is often painful when passed.
An impulse control disorder that results in an irresistible urge to steal.
A genetic condition in which a boy is born with an extra copy of the X chromosome.
Pain in or around the knee that can be due to an injury or a medical condition.
Last Updated: Aug 18, 2023Malnutrition produced by a severely inadequate amount of protein in the diet.
An exaggerated, forward rounding of the upper back.
L
Swelling of the inner ear that can cause problems with hearing and balance.
Last Updated: Feb 28, 2023A condition in which lactic acid builds up in the blood faster than it can be removed.
The inability to fully digest sugar (lactose) in dairy products.
An inflammation of the voice box, which is also known as the larynx. Overuse, irritation or infection can be the cause.
Last Updated: Jan 13, 2023Decreased vision due to abnormal visual development.
A buildup of lead in the body, usually over months or years.
A disorder that affects ability to acquire and use academic skills, such as reading and calculating.
A delay or blockage of electrical impulses to the left side of the heart.
Enlargement of muscle tissue in the heart's lower left chamber (ventricle).
Physical discomfort in part or all of the leg that can vary in intensity.
A noncancerous soft tissue tumor that develops from smooth muscle.
An infection with leishmania parasites spread by sandflies.
A chronic, curable infectious disease mainly causing skin lesions and nerve damage.
A bacterial disease spread through the urine of infected animals.
An abnormal area of tissue inside or outside the body that may get bigger or change appearance, and may or may not be cancerous.
A state of weariness that involves diminished energy, mental capacity, and motivation.
A cancer of blood-forming tissues, hindering the body's ability to fight infection.
A high level of white blood cells in the blood. A high white blood cell count can be caused by infection, reaction to a medicine, a bone marrow disease, an immune system issue, smoking or sudden stress such as hard exercise.
A low level of white blood cells in the blood, which can interfere with the ability to fight infection.
Thickened, white patches inside the mouth.
Whitish or yellowish vaginal discharge.
A chronic condition that causes thin, white patches of skin, usually in the genital area.
Feeling dizzy or about to pass out.
An unsteady walk that can be caused by pain, weakness or injury to the leg.
A fatty lump most often situated between the skin and underlying muscle layer.
A potentially serious infection that can be contracted from meat and dairy products.
Cancer that begins in the cells of the liver.
Loss of liver function.
A noncancerous mass in the liver.
Physical discomfort in the liver, an organ located in the upper right belly.
Flat tan, brown, or black spots on the skin common with age.
Feeling sad and unhappy about being socially isolated.
A heart rhythm disorder that can potentially cause fast, chaotic heartbeats.
A curving inward of the lower back.
The inability to respond to surroundings or stimuli.
Partial or complete loss of the sense of smell.
Last Updated: Jan 18, 2023Physical discomfort with pain affecting the lower half of the back. It can vary in intensity from a dull ache to disabling.
Bleeding from the small intestine, large intestine, rectum, or anus.
Bleeding from the small intestine, large intestine, rectum or anus.
Last Updated: Jan 4, 2020A disease of the root of a nerve in the lower (lumbar) spine.
A narrowing of the open spaces in the lower spine, known as the lumbar spine.
Last Updated: Mar 1, 2023A cancer that begins in the lungs and most often occurs in people who smoke.
A long-term illness that occurs when the immune system attacks its own tissues and organs.
Last Updated: Mar 1, 2023A tick-borne illness caused by the bacterium Borrelia burgdorferi.
A tropical, parasitic disease that affects the lymph nodes and lymph vessels.
Swelling in an arm or leg caused by a lymphatic system blockage.
A cancer of the lymphatic system.
M
A viral respiratory illness caused by a coronavirus.
An eye disease that causes vision loss.
A brain disorder in adult cattle that may be spread to humans through diseased meat.
A low level of the mineral magnesium in the body.
A mood disorder causing a persistent feeling of sadness and loss of interest.
A condition that prevents absorption of nutrients through the small intestine.
A general sense of being unwell, often accompanied by fatigue, diffuse pain, or lack of interest in activities.
A disease caused by a parasite, transmitted by the bite of infected mosquitoes.
Severe reaction to anesthesia drugs causing a high temperature and muscle break down.
To intentionally pretend to have a disease in order to achieve another goal.
Lack of sufficient nutrients in the body.
The abnormal alignment of the upper and lower teeth.
Cancer that starts in a milk duct of the breast.
Extremely elevated and excitable mood usually associated with bipolar disorder.
Condition that makes it hard to break down certain parts of protein (amino acids).
Severe malnutrition with muscle and fat wasting.
An inherited disorder that affects connective tissue.
A painful infection of the breast tissue.
Too many of a type of disease-fighting and wound-healing cells (mast cells).
An infection that affects the mastoid bone, located behind the ear.
A viral infection that can be serious for small children.
A severe form of depression.
A noncancerous mole caused by a disorder of pigment-producing skin cells.
The most serious type of skin cancer.
A condition in which brown patches appear on the face.
Dark tarry stool with or without visible blood.
An inner ear disease that can cause a spinning feeling, ringing in the ear and trouble hearing.
Last Updated: Jan 18, 2023A tumor that arises from the membranes surrounding the brain and spinal cord.
Inflammation of brain and spinal cord membranes, typically caused by an infection.
A serious bacterial infection that affects the brain and spinal cord.
Inflammation of the brain and surrounding tissues, usually caused by infection.
The permanent end of fertility, signaled by 12 months since last menstruation.
Heavy or prolonged vaginal bleeding with menstrual cycle.
Painful or irregular periods.
Inability to think or reason in a focused, clear manner.
A nerve condition characterized by tingling, numbness, and pain in the outer thigh.
A tumor of the tissue that lines the lungs, stomach, heart, and other organs.
A condition in which too much acid accumulates in the body.
Too much of a certain type of the chemical bicarbonate in the body.
A cluster of conditions that increases the risk of heart disease, stroke, and diabetes.
Inflammation of the ball of the foot (metatarsals).
A sprain of the main joint in the big toe (turf toe).
Bleeding from the uterus that occurs in between periods, may occur every few weeks, and the flow may be heavier than usual.
An abnormally small penis.
Discomfort in the area of the spine between the base of the neck to the bottom of the ribcage.
An intense headache often accompanied by nausea and sensitivity to light and sound.
A tiny, white bump that commonly appears on a baby's face.
A skin condition caused by blocked sweat ducts and trapped sweat beneath the skin.
Contraction of the pupil, which can be temporary or permanent, depending on the cause.
Spontaneous loss of a pregnancy before the 20th week, most often before the 12th week.
A strong reaction to specific sounds.
A disorder that occurs when structures that produce energy for a cell malfunction.
Improper closure of the valve between the heart's upper and lower left chambers.
A backflow of blood caused by failure of the heart's mitral valve to close tightly.
A tumor that develops in the uterus as a result of a nonviable pregnancy.
Last Updated: Aug 31, 2022A mole (pigmented skin lesion).
A viral skin infection that results in round, firm, painless bumps.
A large, blue-gray birthmark.
An abrupt change in mood or emotional state.
An unexplained skin disorder that produces crawling sensations and skin sores.
Nausea with or without vomiting during pregnancy, usually early pregnancy, at any time of day.
A thickening of the tissue around a nerve leading to the toes.
Illness caused by motion during travel.
One or more painful sores on inner lips, gums, tongue, roof of the mouth, or throat that may interfere with eating, such as a canker sore.
A cancer of plasma cells.
A disease in which the immune system eats away at nerves' protective covering.
A viral infection that affects the salivary glands.
A severe mental condition in which someone pretends to be sick for no obvious reason.
A severe mental condition in which someone imposes symptoms on a healthy person.
Involuntary contractions of a muscle, typically harmless and temporary, but can be painful.
Soreness and achiness in the muscles that can range from mild to severe.
Aching, tender muscles.
Decreased strength in the muscles.
A group of genetic diseases that cause progressive weakness and loss of muscle mass.
Last Updated: Jan 31, 2020A weakness and rapid fatigue of muscles under voluntary control.
Any disease caused by a fungus.
Dilated pupils, which may occur normally or in response to a trauma, illness, or drugs.
A group of disorders caused when something disrupts the production of blood cells.
A serious bone marrow condition that disrupts blood cell production.
A nervous system disorder that affects the spinal cord.
A blockage of blood flow to the heart, also known as a heart attack.
Inflammation of the middle layer of the heart wall.
A sudden, involuntary muscle jerk, shake, or spasm.
A chronic muscular pain disorder.
A disease of the muscles.
A condition in which close objects appear clearly, far ones don't (nearsightedness).
Swelling, called inflammation, in the muscles.
A muscle disease featuring an inability to relax muscles at will.
A dry, waxy swelling of the skin.
N
An abnormal, rounded shape of the nail bed.
Personality qualities include thinking very highly of oneself, needing admiration, believing others are inferior, and lacking empathy for others.
A disorder in which a person has an inflated sense of self-importance.
A chronic sleep disorder that causes overwhelming daytime drowsiness.
The inside of the nose can swell with fluid and mucus. Infection, tobacco smoke or perfume can be the cause.
A painless growth inside the nose or the hollow areas inside the bones of the face, also known as sinuses.
Last Updated: May 12, 2023Off-center position of the wall between the nostrils, making one entry into the nose, also known as the nasal passage, smaller.
Last Updated: May 19, 2023A cancer of the area behind the nose and above the back of the throat (nasopharynx).
A queasy sensation including an urge to vomit.
Pain in the neck and shoulder that varies in intensity, and may feel achy or like an electric shock from the neck to the arm.
Death of cells or tissue through disease or injury.
A serious bacterial infection that destroys tissue.
Getting stuck by a needle that has someone's blood or other body fluid on it.
Red bumps that appear on a baby's cheeks, nose, and forehead.
A liver condition that causes yellowing of a newborn baby's skin and eyes.
A breathing disorder in newborns caused by immature lungs.
A life-threatening, vaccine-preventable bacterial infection in newborns.
Inflammation of the kidneys.
A disease in which the body has trouble balancing fluid levels due to a kidney problem.
Last Updated: Mar 7, 2023A kidney disorder that causes the body to excrete too much protein in the urine.
A condition in which a nerve is damaged due to overuse or compression.
Damage to a nerve.
Pain caused by damaged or irritated nerves.
Pain that travels along the length of a nerve.
A cancer that is commonly found in the adrenal glands.
A deterioration of the nerves.
A condition in which the neuroendocrine cells develop into tumors.
A condition that causes tumors to form in the brain, spinal cord, and nerves.
Condition in which the bladder doesn't function properly due to brain or nerve damage.
A life-threatening nervous system reaction to certain drugs.
A group of diseases that affect nerve and muscle function.
A disorder that causes swelling of the eye nerves and the spinal cord.
Breaking down of a joint from nerve damage caused by diabetes.
An abnormally low count of a type of white blood cell called neutrophils.
Physical and mental symptoms that occur after stopping or cutting back use of tobacco products.
Last Updated: Mar 14, 2020Significant perspiration during sleep, usually has an underlying cause such as menopause, an illness, or medication side effect.
Episodes of screaming, intense fear, and flailing while still asleep, often paired with sleepwalking.
Frightening dreams, usually during REM sleep, that are normal and common in children under 10 and can also affect teens and adults.
A dry, sore, irritated, or cracked nipple.
Urinating frequently at night.
Nighttime loss of bladder control, or bed-wetting, usually in children.
Fluid-filled or solid lump that often doesn't indicate anything serious is wrong.
Cancer the starts in the lymphatic system.
One of two major types of lung cancer that can affect smokers and nonsmokers.
The accumulation of liver fat in people who drink little or no alcohol.
A genetic condition preventing normal development in parts of the body.
When a person bleeds from the nose.
Last Updated: Nov 30, 2022Coin-shaped rash or sores.
Any condition caused by poor diet or inability of the body to use certain nutrients.
An involuntary eye movement which may cause the eye to rapidly move from side to side, up and down, or in a circle, and may slightly blur vision.
O
A disorder that involves having too much body fat, which increases the risk of health problems.
Excessive thoughts (obsessions) that lead to repetitive behaviors (compulsions).
A condition in which breathing stops and starts during sleep.
A severe headache that begins at the back of the neck and spreads upward.
Pain while swallowing.
Inflammation or irritation of a small sac of fluid, known as the olecranon bursa, on the tip of the elbow.
Less than normal urine output.
A parasitic, tropical disease that affects the skin and eyes.
A condition in which the corner or side of a toenail grows into the flesh.
A nail fungus causing thickened, brittle, crumbly, or ragged nails.
An often harmless infection that becomes serious due to a weakened immune system.
Last Updated: Oct 22, 2019A disorder in a child marked by defiant and disobedient behavior to authority figures.
Inflammation of the optic nerve.
Cancer that develops in any part of the mouth.
An infection in which the fungus Candida albicans accumulates in the mouth.
A noncancerous mucus-containing salivary gland cyst.
Inflammation of 1 or both testicles.
Discomfort when breathing while lying down flat; common in people with some types of heart or lung conditions.
A form of low blood pressure that happens when standing up from sitting or lying down.
A childhood repetitive use injury that causes a painful lump below the kneecap.
Last Updated: Oct 9, 2019Bone formation, generally referring to soft tissues becoming calcified and hardened.
Type of arthritis that occurs when flexible tissue at the ends of bones wears down.
Last Updated: May 12, 2023A group of disorders passed through families that cause fragile bones that break easily.
An infection in a bone.
A condition in which bones become weak and brittle.
A type of bone cancer that begins in the cells that form bones.
Last Updated: Dec 6, 2019Irritation and swelling of the ear, often from infection.
Last Updated: Jan 13, 2023An infection of the outer ear canal, also called swimmer's ear. The outer ear canal runs from the eardrum to the outside of the head.
Last Updated: Jan 28, 2023An infection of the air-filled space behind the eardrum, also known as the middle ear.
Last Updated: May 10, 2023A cancer that begins in the female organs that produce eggs (ovaries).
A solid or fluid-filled sac or pocket (cyst) within or on the surface of an ovary.
A condition in which the ovaries swell and get painful from excess hormone.
Last Updated: Nov 9, 2021A problem with bladder function that causes the sudden need to urinate.
Weight above what's considered healthy, often measured using body mass index (BMI).
Usually one-sided, lower belly pain associated with normal ovulation.
An imbalance between levels of antioxidants and free radicals in the body.
P
A disease that disrupts the replacement of old bone tissue with new bone tissue.
A form of breast cancer affecting the nipple and dark circle of skin around it.
Physical discomfort ranging from mild to severe, usually caused by injury, illness, or a nerve condition.
Interstitial cystitis is a chronic, painful bladder condition.
Paleness or loss of color from the skin or mucous membranes.
A sensation that the heart is racing, pounding, fluttering, or skipping a beat, often bothersome, but hardly ever a sign of heart disease.
Cancer that begins in the organ lying behind the lower part of the stomach (pancreas).
An inflammation of the organ lying behind the lower part of the stomach (pancreas).
Condition in which blood has fewer red cells, white cells, and platelets than normal.
A sudden episode of intense fear that triggers severe physical reactions when there is no real danger or apparent cause.
Sudden episode of intense fear or anxiety and physical symptoms, based on a perceived threat rather than imminent danger.
Repeated episodes of sudden and intense fear when no real danger exists.
The most common form of cancer of the butterfly-shaped gland in the neck (thyroid).
Last Updated: Jan 21, 2020Small raised, tender bump on the skin.
Last Updated: Sep 3, 2020Complete or partial loss of muscle function.
A group of symptoms that develops in some people who have cancer.
An unrealistic distrust of others or a feeling of being persecuted. Extreme degrees may be a sign of mental illness.
Sexual behaviors generally considered harmful or unacceptable or that are illegal.
Paralysis that affects all or part of the trunk, legs, and pelvic organs but not the arms.
Partial loss of muscle function.
Tingling or prickling, “pins-and-needles” sensation; usually temporary, often occurs in the arms, hands, legs, or feet.
A disorder of the nervous system that affects movement, often including tremor.
An infection of the tissue folds around the nails.
Inflammation of 1 or both of the largest saliva-producing glands inside the cheeks.
A pattern of indirectly expressing negative feelings instead of openly addressing them.
A condition in which a person has an extra chromosome 13.
An injury to the tissue connecting the kneecap to the shinbone (patellar tendon).
A condition in which the cartilage under the kneecap is damaged due to injury or overuse. The kneecap also is known as the patella.
A heart defect caused by problems in the heart's development.
Inappropriate involuntary laughing and crying due to a nervous system disorder.
The compulsive urge to lie about matters big and small, regardless of the situation.
A condition in which the breastbone protrudes outward abnormally.
A condition in which the breastbone sinks into the chest.
Last Updated: Aug 4, 2023An infection of the female reproductive organs.
Pain or discomfort, ranging from a sharp jab to a dull ache, in the lowest part of the abdomen and pelvis.
A growth of cells that affects the penis.
A tear of one of the two tubes, also known as cylinders, that cause the penis to become erect.
Last Updated: Jan 12, 2023A sore that develops on the lining of the esophagus, stomach, or small intestine.
A hole or tear in the tissue that divides the ear canal from the middle ear, also called the eardrum.
Last Updated: Jan 31, 2023A collection of pus in the tissue around the anus and rectum.
A buildup of too much fluid in the sac around the heart.
A swelling and irritation of the thin saclike membrane surrounding the heart (pericardium).
Disease of the gums and tissue that support the teeth.
A serious gum infection that damages gums and can destroy the jawbone.
Inflammation of the skin around the mouth.
Dark circles under the eyes.
Swelling or puffiness around the eye area.
Weakness, numbness, and pain from nerve damage, usually in the hands and feet.
A circulatory condition in which narrowed blood vessels reduce blood flow to the limbs.
Inflammation of the membrane lining the abdominal wall and covering the abdominal organs.
A decrease in red blood cells that happens when the body can't absorb enough vitamin B-12.
A chronic state of brain dysfunction in which a person shows no signs of awareness.
Sweating from sweat glands, often in response to heat, exercise, or stress.
A highly contagious respiratory tract infection.
Last Updated: Oct 9, 2019A group of disorders characterized by delayed social and communication development.
A condition in which the arch of the foot is higher than normal.
Tiny round brown-purple spots due to bleeding under the skin, may be in a small area due to minor trauma or widespread due to blood-clotting disorder.
Brief, sudden lapses of consciousness.
Fibrous scar tissue inside the penis that causes curved, painful erections.
The most common cause of a sore throat, usually from an infection.
Last Updated: Mar 1, 2023A birth defect that causes an amino acid called phenylalanine to build up in the body.
A rare type of tumor, usually not cancer, that develops in an adrenal gland.
A condition in which tight foreskin can't be pulled back over the head of the penis.
Inflammation of a vein.
Mucus, thicker than normal due to illness or irritation, coughed up from the respiratory tract.
Skin inflammation caused by exposure to the sun or ultraviolet radiation.
Last Updated: Jan 21, 2020Use of force to cause physical harm or pain to someone.
Craving and chewing substances that have no nutritional value, such as ice, clay, soil or paper.
Last Updated: Jun 30, 2023An abnormal skin growth located at the tailbone that contains hair and skin.
Red, tender bumps with white pus at their tips.
A skin pore clogged with oil, dead skin cells, and bacteria, usually on the face, neck, chest, back, or shoulders.
A disorder in which the piriformis muscle irritates the sciatic nerve.
This tumor in the pituitary gland isn't cancer, and it often doesn't spread beyond the skull.
A skin rash that usually begins as a large spot on the chest, belly, or back.
When the placenta covers the opening in the mother's cervix.
A serious problem during pregnancy that involves the placenta, the organ that brings oxygen and nutrients to the baby.
Last Updated: Feb 21, 2023A flat spot on a baby's head.
An inflammation of a thick band of tissue that connects the heel bone to the toes.
Hard, grainy growths that appear on the heels or balls of the feet.
May refer to a substance that collects in and hardens blood vessels, builds up on tooth enamel, or appears on skin due to certain conditions.
Last Updated: Feb 19, 2020A buildup of fluid between the tissues that line the lungs and the chest.
Inflammation of the tissues that line the lungs and the chest.
A serious lung infection caused by the fungus Pneumocystis jiroveci.
Infection that inflames air sacs in 1 or both lungs, which may fill with fluid.
A general term that refers to inflamed lung tissue, but usually not to pneumonia.
A collapsed lung.
A virus that may cause paralysis.
A genetic disease in which fluid-filled sacs called cysts grow mainly in the kidneys.
Last Updated: May 13, 2023A hormonal disorder causing enlarged ovaries with small cysts on the outer edges.
An unusual increase in the number of red blood cells in the blood.
A slow-growing blood cancer in which bone marrow makes too many red blood cells.
Last Updated: Jan 23, 2020A condition of having more than 5 digits on a hand or 5 toes on a foot.
Intense thirst despite drinking plenty of fluids.
A condition in which excess fluid develops in a pregnant woman's womb.
An inflammatory disorder causing muscle pain and stiffness around the shoulders and hips.
Abnormal tissue growth on a mucous membrane.
Excessive eating.
Passing abnormally large amounts of urine.
Disorders resulting from buildup of certain chemicals related to red blood cell proteins.
High blood pressure in the vein that carries blood from the intestine to the liver.
A complex disorder in which several post-concussion symptoms last for weeks or months.
Pain from shingles that lasts long after a shingles rash and blisters disappear.
Mucus that builds up and drips down the back of the nose and the throat.
Last Updated: Apr 12, 2023Depression that occurs after childbirth.
Too much bleeding after a baby is born.
A mental health condition triggered by experiencing or seeing a terrifying event.
Symptoms related to reduced blood volume that occur when standing up.
A genetic disorder that affects the body, mind, and behavior.
A pregnancy complication characterized by high blood pressure.
A condition in which a child's body begins changing into that of an adult too soon.
Last Updated: Mar 7, 2023A blood sugar level that is higher than what's considered healthy, but not high enough to be type 2 diabetes.
Last Updated: Mar 7, 2023Orgasm and emission of semen occurring just before or shortly after beginning sexual intercourse.
Menopause occurring before age 40 caused by chemotherapy or surgical removal of the ovaries.
Last Updated: Apr 26, 2018Extra, abnormal heartbeats that begin in one of the heart's two lower chambers.
A severe, sometimes disabling extension of PMS.
A group of symptoms that occur in women, typically between ovulation and a period.
Injury to skin and underlying tissue resulting from prolonged pressure on the skin.
Last Updated: Feb 29, 2020A birth that takes place too early, before the 37th week of pregnancy.
Last Updated: Feb 22, 2023A prolonged erection of the penis, usually without sexual arousal.
A loss of normal function of the ovaries before age 40.
Last Updated: Oct 27, 2021Inflammation of the lining of the tube connected to the end of the colon (rectum).
A progressive genetic disorder that causes children to age rapidly.
A brain condition causing serious walking, balance, and eye movement problems.
This tumor of the pituitary gland isn't cancer, but it can cause vision problems, infertility and other health issues.
A bulging or falling out of a body part, such as the rectum or vagina.
A cancer in a man's prostate, a small walnut-shaped gland that produces seminal fluid.
Swelling of the small walnut-shaped gland (prostate) that produces seminal fluid.
An excess of protein in the urine.
An itchy rash that can happen during the last three months of pregnancy.
An uncomfortable, irritating sensation that creates an urge to scratch that can involve any part of the body.
A form of arthritis with sudden, painful swelling in one or more joints.
Last Updated: Aug 4, 2023A condition that occurs when pressure inside the skull increases for no obvious reason.
A condition in which skin cells build up and form scales and itchy, dry patches.
Last Updated: Sep 22, 2023A form of arthritis that affects some people who have the skin condition psoriasis.
A mental disorder causing dysfunction in thinking, perceiving, and relating to others.
A mental disorder characterized by a disconnection from reality.
A growth that starts on the clear tissue of the eye that can spread to the cornea.
Abnormal low-lying or drooping upper eyelid.
A condition in which tiny insects infest the genital area.
A condition in which food, liquids, saliva, or vomit is breathed into the airways.
A condition caused by excess fluid in the lungs.
A condition in which 1 or more pulmonary arteries in the lungs become blocked.
A type of high blood pressure that affects arteries in the lungs and in the heart.
A condition in which small blood vessels leak blood into the skin, joints, intestines, or organs, that may be caused by certain disorders or aging.
A life-threatening childhood infection caused by bacteria.
Last Updated: Oct 11, 2019Thick fluid caused by infection that includes white blood cells and cellular debris, and may be white, yellow, or pink or green tinged.
Inflammation of the kidney due to a bacterial infection.
A condition in which the opening between the stomach and small intestine thickens.
Q
An infection caused by the bacterium Coxiella burnetii.
Paralysis including the trunk, pelvic area, and both arms and legs.
A complication of tonsillitis in which pus collects behind the tonsils.
Last Updated: Jan 18, 2023R
A deadly virus spread to people from the saliva of infected animals.
A disease of the root of a nerve, such as from a pinched nerve or a tumor.
A condition in which some areas of the body feel numb and cool in certain conditions.
A condition in which shaved beard hair curves into the skin, causing inflammation.
Joint pain and swelling triggered by an infection in another part of the body.
Last Updated: Aug 30, 2022The passage of mucus or other liquid from the anus.
A condition that occurs when part of the large intestine slips outside the anus.
A condition in which the tissue wall between the rectum and vagina weakens.
Eye redness from irritated or inflamed blood vessels on the surface of the white part of the eye, commonly called bloodshot eyes.
When undigested or partially digested food comes back up through the esophagus and is reswallowed or spit out.
The most common type of kidney cancer in adults.
Last Updated: Oct 2, 2021Waves of sharp, intense pain caused by kidney dysfunction.
A condition in which the kidneys lose the ability to remove waste and balance fluids.
Damage and pain caused by motions repeated over and over.
Last Updated: Jan 12, 2023A condition in which the lungs can't remove all of the body's carbon dioxide.
A condition in which the legs feel extremely uncomfortable, typically in the evenings.
Difficulty fully expanding the lungs with air.
An emergency when part of the eye (the retina) pulls away from supportive tissue.
An eye disease in which the back wall of the eye (retina) is damaged.
An eye cancer that begins in the back of the eye (retina), most commonly in children.
A rare genetic mutation affecting brain development in girls.
A serious condition that causes swelling in the liver and brain.
A breakdown of muscle tissue that releases a damaging protein into the blood.
Last Updated: Jun 3, 2023A cancer that begins in the muscles.
A disease that can result from inadequately treated strep throat or scarlet fever.
A chronic inflammatory disorder affecting small joints in the hands and feet.
Repeated sneezing or a stuffy, drippy nose, either from an allergy or from no known cause.
An injury that occurs when one of the bones in the rib cage cracks.
A softening and weakening of bones in children, usually due to not getting enough vitamin D.
A delay or blockage of electrical impulses to the right side of the heart.
A highly contagious, fungal infection of the skin or scalp caused by parasites.
A serious infection caused by bacteria from a tick bite.
A condition that causes redness and, often, small, red, pus-filled bumps on the face.
A common viral infection in young children that may cause high fever and a rash.
A tear in the tissues connecting muscle to bone, called tendons, around the shoulder joint.
Swelling of the tissues, called tendons, that connect the muscles and bones in the shoulder.
A group of viruses that commonly cause stomach upset and diarrhea, especially in children.
A contagious viral infection best known by its distinctive red rash.
Repeatedly spitting up undigested or partially digested food, then rechewing it or spitting it out.
A lot of fluid runs out of the nose, down the back of the throat or both. It can range from clear fluid to thick mucus.
Last Updated: Apr 8, 2023S
An injury to the ring of fibrous tissue around the shoulder joint.
Symptoms that may occur when stopping SSRI antidepressants.
Inflammation of 1 or both of the joints that connect the lower spine and pelvis.
Feeling down or unhappy in response to grief, discouragement, or disappointment; if ongoing, may indicate depression.
An infection with salmonella bacteria, commonly caused by contaminated food or water.
The growth of tiny collections of inflammatory cells in different parts of the body.
A tumor that occurs in the bones and soft tissues.
A contagious, intensely itchy skin condition caused by a tiny, burrowing mite.
Menstrual periods that occur less often than the average 28-day cycle.
A common wrist fracture.
A growth of tissue marking the spot where skin has healed after an injury.
A bacterial illness that develops in some people who have strep throat.
A disease caused by parasitic worms found in certain freshwater snails.
A mental health condition including schizophrenia and mood disorder symptoms.
A condition in which people avoid social activities and interacting with others.
A brain disorder in which people interpret reality abnormally, such as hallucinations.
An often noncancerous tumor of the cells in the tissue that covers the nerves.
Pain that travels along the path of the sciatic nerve, which runs down each leg from the lower back.
Chronic hardening and tightening of the skin and connective tissues.
A hardening of a tissue in the body from inflammation, scarring or disease.
Last Updated: Feb 19, 2020A sideways curvature of the spine.
An injury caused by the venom of a scorpion.
A condition caused by a severe lack of vitamin C in the diet.
Nausea and uneasiness caused by a ship's movements.
A mood disorder characterized by depression that occurs at the same time every year.
A small, slow-growing, noncancerous bump beneath the skin.
A skin condition that causes scaly patches and red skin, mainly on the scalp.
A noncancerous skin condition that appears as a waxy brown, black, or tan growth.
A pregnancy in the second three months or weeks 13 to 27.
Last Updated: Feb 22, 2022Uncontrolled jerking, loss of consciousness, blank stares, or other symptoms caused by abnormal electrical activity in the brain.
A condition in which a child who can speak doesn't speak in certain situations.
The act of deliberately harming the surface of one's own body, such as cutting or burning.
This type of hearing loss involves damage to the inner ear or the nerve from the ear to the brain.
Last Updated: Jan 13, 2023A disorder in which a child becomes excessively anxious when separated from parents.
A life-threatening complication of an infection that's triggered by inflammation.
A widespread infection causing organ failure and dangerously low blood pressure.
A tumorlike accumulation of fluid under the skin.
Potentially life-threatening symptoms that can occur when antidepressants are taken with other medications that also raise serotonin levels.
Last Updated: Jan 22, 2022A contagious and sometimes fatal respiratory illness caused by a coronavirus.
A serious, inherited inability to fight even mild infections (bubble boy disease).
Any sexual activity not agreed to.
Ongoing problems with the ability to have sex.
Last Updated: May 12, 2023A serious brain injury resulting from forcefully shaking an infant or toddler.
Pain along the shinbone, the large bone in front of the lower leg.
Last Updated: Jun 24, 2023Involuntary trembling of the body caused by muscle contractions.
Occurs when organs don't get enough blood.
Physical discomfort of the shoulder, including the joint itself or the muscles, tendons and ligaments that support the joint.
Heart rhythm conditions in which the heart's natural pacemaker malfunctions.
A group of disorders that cause red blood cells to become misshapen and break down.
Last Updated: Jan 30, 2020A condition in which a child inherits the sickle cell gene mutation from only one parent.
Last Updated: Jan 30, 2020A condition in which the spaces inside the nose become inflamed.
Last Updated: Dec 28, 2022An immune system illness that mainly causes dry eyes and dry mouth.
Last Updated: Jan 28, 2023The abnormal growth of skin cells.
An infection of the skin caused by bacteria or by a fungus, virus, or parasite.
Abnormal appearance or growth on the skin.
Temporary outbreak of red, bumpy, scaly, or itchy patches of skin, possibly with blisters or welts.
A common skin growth in which a short, narrow stalk sticks out of the skin.
A potentially serious sleep disorder in which breathing repeatedly stops and starts.
A potentially serious sleep disorder in which breathing repeatedly stops and starts.
Not getting the required amount of sleep.
A temporary inability to move or speak while falling asleep or upon waking.
The act of getting up and walking around while asleep.
A condition in which abnormally high numbers of bacteria grow in the small intestine.
Last Updated: Feb 28, 2020A type of lung cancer commonly caused by smoking.
Last Updated: Oct 5, 2021This serious, often deadly disease has been wiped out because of a vaccine.
An injury caused by a bite from a snake.
A sudden blast of air or mucus from the mouth and nose.
Last Updated: Mar 1, 2023Hoarse or harsh sound from nose or mouth that occurs when breathing is partially obstructed while sleeping.
Chronic mental health condition in which social interactions cause irrational anxiety.
A mental disorder causing dysfunction in thinking, perceiving, and relating to others.
A type of cancerous tumor that originates in soft tissue.
A group of infections with worms including hookworm, roundworm and whipworm.
Last Updated: Jan 3, 2020A mental disorder in which someone has pain or symptoms without a physical cause.
Excessive sleepiness.
Pain or irritation of the throat, often caused by an infection such as a cold or flu. Swallowing often makes it feel worse.
Last Updated: Jan 31, 2023Muscle overactivity that occurs when communication between the brain and spinal cord is affected by injury or illness.
An injury caused by venom from a spider's bite.
Occurs when one or more bones in the spine weaken and crumple.
Damage to any part of the spinal cord or nerves at the end of the spinal canal.
A condition that refers to a problem with a rubbery disk between the spinal bones.
A narrowing of the open spaces in the spine.
Last Updated: Jan 24, 2023An enlarged spleen.
Inflammation of the spine (vertebrae).
Last Updated: Nov 8, 2019A group of inflammatory conditions that cause arthritis, especially of the spine.
A spinal disorder in which a bone called a vertebra slips forward onto the bone below it.
Last Updated: Nov 19, 2021A general term for age-related wear and tear of the spinal disks.
An infectious disease with a characteristic rash, often transmitted by the bite of a tick.
A stretching or tearing of ligaments, the fibrous tissue that connects bones and joints.
Last Updated: Jun 2, 2023An injury that occurs when the ankle rolls, twists or turns in an odd way.
Last Updated: Jan 31, 2023An injury of the tissue (ligament) connecting the bones at the base of the thumb.
Thick mixture of saliva and phlegm that's coughed up from the respiratory tract.
A form of skin cancer that develops in the cells of the outer layer of the skin.
Anxiety and panic caused by the thought of performing.
An infection caused by usually harmless bacteria commonly found on the skin or in the nose.
An infection caused by staphylococcus bacteria commonly found on skin or in the nose.
Long-term, severe deprivation of nutrition.
Oily, smelly stools, which often float.
An abnormal narrowing of an open space in the body, such as a blood vessel.
An abnormal narrowing of a blood vessel, duct, canal, or tube.
A rare, serious disorder of the skin and mucous membranes.
Last Updated: Apr 14, 2020A feeling of soreness or pain in the neck when trying to move it or turn the head from side to side.
A condition in which the trunk and limbs stiffen, making it hard to walk.
Being less flexible than usual, commonly in the joints.
Cancer that occurs in the stomach.
A condition that causes painful swelling and sores inside the mouth.
Last Updated: Jul 10, 2020Disorder in which the eyes don't look in exactly the same direction at the same time.
An injury to a muscle or to the band of tissue that attaches a muscle to a bone, called a tendon.
Last Updated: Jun 2, 2023Also called strep throat, a bacterial infection that may cause a sore, scratchy throat.
A tiny crack in a bone caused by repetitive stress or force, often from overuse.
Indented, reddened streaks that usually appear on the skin from rapid weight gain or from weight changes.
A high-pitched, whistling sound most often heard while taking in a breath.
A disruption of blood supply to part of the brain, starving brain tissue of oxygen.
A speech disorder involving frequent problems with the normal fluency and flow of speech.
A red, painful lump near the edge of the eyelid that may look like a boil or pimple.
Bleeding in the space between the brain and the tissue covering the brain.
A pool of blood between the brain and its outermost covering.
A pattern of repeated drug or alcohol use that often interferes with health, work, or social relationships.
Thinking about or planning suicide.
A type of skin burn resulting from too much exposure to sunlight or sunlamps.
A faster than normal heart rate beginning above the heart's 2 lower chambers.
Puffiness caused by excess fluid trapped in the body's tissues.
A human respiratory infection caused by an influenza strain that started in pigs.
Buildup of fluid in the foot and ankle area.
Lymph nodes are immune system glands that usually swell in response to a bacterial or viral infection. Rarely, swollen lymph nodes are caused by cancer.
Fainting, or a sudden temporary loss of consciousness.
A condition in which high levels of a hormone cause the body to retain water.
Swelling, pain and warmth, called inflammation, of the lining of a joint or tendon.
A bacterial infection usually spread by sexual contact that starts as a painless sore.
The development of a fluid-filled cyst in the spinal cord.
An illness that occurs when the immune system attacks its own tissues and organs.
Last Updated: Mar 1, 2023T
A rapid or pounding heartbeat that may be regular or irregular, but is out of proportion to age and level of exertion or activity.
Fast, shallow breathing.
A tapeworm infection that affects the digestive system.
A temporary heart condition that may feel like a heart attack.
An infection caused by consuming tapeworm eggs or larvae.
Last Updated: Dec 18, 2019A disorder of abnormal, involuntary and unwanted movements often caused by long-term use of certain psychiatric drugs.
Last Updated: Nov 19, 2021A rare, inherited disorder that destroys nerve cells in the brain and spinal cord.
A common injury in which forceful twisting causes certain tissue in the knee to tear.
Dilated small blood vessels on the skin or mucous membranes, anywhere in the body.
A reversible condition in which hair falls out after a stressful experience.
An inflammation in the blood vessels, called arteries, in the temples. This condition is also called giant cell arteritis.
Pain and compromised movement of the jaw joint and the surrounding muscles.
A condition in which the tissue connecting muscle to bone becomes inflamed.
A breakdown of tendon tissue caused by repetitive motions or overuse.
An irritation of the tissue connecting the forearm muscle to the elbow.
Last Updated: Jun 24, 2023Inflammation of the tendon sheath where muscle connects to bone.
A mild to moderate pain often described as feeling like a tight band around the head.
A type of germ cell tumor that may contain several types of body tissue.
Cancer in the male organs that make male hormones and sperm (testicles).
Pain that occurs in or around one or both testicles.
A twisting of the male organ that makes hormones and sperm (testicle).
A serious bacterial infection that causes painful muscle spasms and can lead to death.
A rare condition involving four heart problems present at birth.
A blood disorder involving less than normal amounts of an oxygen-carrying protein.
Last Updated: Nov 22, 2019A pregnancy in the last three months or weeks 28 to 40.
Last Updated: Feb 22, 2022A craving for something to drink, often associated with dehydration.
A group of disorders that occur when certain blood vessels or nerves are compressed.
A condition in which blood vessels get inflamed, swollen, and blocked with clots.
A low number of platelets in the blood.
Last Updated: Apr 8, 2020A condition in which the body overproduces the blood cells that help clotting.
A condition that increases a person's risk of forming clumped masses of blood (clots).
A condition in which a blood clot blocks 1 or more veins, often in the legs.
The development of a mass of clumped blood (blood clot) in a blood vessel.
A blood clot that forms on and remains attached to the wall of a blood vessel.
A cancer in the butterfly-shaped gland at the base of the neck (thyroid).
Last Updated: Jan 21, 2020Any problem with the butterfly-shaped gland at the base of the neck, called the thyroid.
Last Updated: Apr 8, 2023A lump that forms within the butterfly-shaped gland at the base of the neck (thyroid).
Last Updated: Mar 15, 2023A compulsive, repetitive sound or movement that’s often difficult to control.
An illness acquired from a tick bite.
A fungal infection of the scalp and hair shafts, often called ringworm of the scalp.
Last Updated: Jan 22, 2022Fungal infection in the skin of the groin and inner thighs. Also called jock itch.
A fungal infection that usually begins between the toes, also called athlete's foot.
A common fungal infection that causes small, discolored patches of skin.
Ringing or other noises in one or both ears that may be constant or come and go.
Last Updated: Feb 25, 2023A seizure that involves a loss of consciousness and violent muscle contractions.
Swelling of the tonsils, the two oval-shaped pads of tissue at the back of the throat.
Last Updated: May 19, 2023A lump of calcified material in the fleshy pads at the back of the throat (tonsils).
A condition in which a tooth fails to fully emerge (erupt).
Pain or inflammation in or around the tooth, often caused by tooth decay or infection.
A rare condition in which the neck muscles contract, causing the head to twist to one side.
A nervous system disorder involving repetitive movements or unwanted sounds.
A rare, life-threatening complication of certain bacterial infections.
An infection with a parasite known as Toxoplasma gondii.
A bacterial infection that affects the eyes.
A brief attack, like a stroke, but lasts only minutes and causes no permanent damage.
The rejection of a transplanted organ, limb, or tissue by the immune system.
Brain dysfunction caused by an outside force, usually a violent blow to the head.
An inherited condition in which some bones and tissues in the face aren't developed.
An allergy to nuts that grow on trees.
Involuntary shaking or movement, ranging from slight to severe, and commonly affecting hands, legs, face, head, or vocal cords.
A type of roundworm infection.
A sexually transmitted infection caused by a parasite.
A disorder that involves recurrent, irresistible urges to pull out body hair.
A chronic pain condition affecting the trigeminal nerve in the face.
A condition in which a finger bends and gets stuck, then snaps straight.
Last Updated: Jan 31, 2023A genetic disorder in which a person has 3 copies of a chromosome instead of 2.
A common type of chronic hip pain.
A potentially serious infectious bacterial disease that mainly affects the lungs.
An inherited condition in which noncancerous lesions grow in the body.
A chromosomal disorder that affects only females.
A lifelong condition where the pancreas makes little or no insulin, which leads to high blood sugar levels.
A long-term condition that affects the way the body processes blood sugar.
Last Updated: Mar 15, 2023A bacterial disease spread through contaminated food and water or close contact.
A bacterial disease spread by lice or fleas.
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A chronic, inflammatory bowel disease that causes inflammation in the digestive tract.
A condition in which the long nerve in the arm gets compressed or irritated.
A condition in which the intestine protrudes through the abdominal muscles.
A weight considered too low for good health.
Serious new or changed chest pain caused by reduced blood flow to the heart (angina).
Physical discomfort affecting the upper part of the back that may vary from a dull ache to incapacitating pain.
Last Updated: Sep 9, 2022Bleeding in the esophagus, the stomach or the first part of the small intestine.
A common viral infection that affects the nose, throat, and airways.
A condition involving abnormally high levels of waste products in the blood.
Inflammation of the tube carrying urine from the bladder to the outside of the body.
A common problem where a person loses control of the bladder, the organ that stores urine.
Last Updated: May 12, 2023Difficulty urinating and completely emptying the bladder.
An infection in any part of the urinary system, the kidneys, bladder, or urethra.
A type of cancer that begins in the uterus.
Tightening of uterine muscle fibers that occurs briefly and intermittently throughout pregnancy and more regularly and forcefully during active labor.
Noncancerous growths of the uterus that often appear during the childbearing years.
An inflammation of the middle layer of the eye (uvea).
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Bleeding from the vagina that isn't linked to usual menstrual periods.
Cancer that occurs in the vagina.
A mix of fluid and cells from the vagina that varies from whitish and sticky to clear and watery, possibly associated with an odor.
Expulsion of air or gas from the vagina.
An inflammation of the vagina that can result in discharge, itching and pain.
Last Updated: Dec 22, 2021An infection with the fungus coccidioides, sometimes called valley fever.
An enlargement of the veins within the scrotum.
Gnarled, enlarged veins, most commonly appearing in the legs and feet.
Brain damage caused by multiple strokes.
A swelling of the blood vessels that causes changes in the blood vessel walls.
Last Updated: Jun 30, 2023A widening of blood vessels, usually near the surface of skin, leading to increased blood flow with flushing or warmth.
A sudden drop in heart rate and blood pressure, often in reaction to a stressful trigger.
Fainting caused by an overreaction to certain triggers.
A condition in which a blood clot blocks 1 or more veins.
A wound on the leg or ankle caused by abnormal or damaged veins.
An irregular heart rhythm that results in a rapid and erratic heartbeat.
A heart defect in which there's an opening in the heart between the lower chambers.
A condition in which the lower chambers of the heart (ventricles) beat very quickly.
The sudden sense of spinning or the inside of the head spinning.
Last Updated: Nov 9, 2022A noncancerous tumor on the main nerve leading from the inner ear to the brain.
Any of a group of infectious diseases that interfere with the blood's ability to clot.
An inflammation of the membranes surrounding the brain and spinal cord.
A disease caused by infection with leishmania parasites.
The ability to visually identify forms, letters and symbols at a standardized distance away.
Too little vitamin A in the diet.
Anemia or nervous system injury from lower than normal amounts of vitamin B-12.
A disease that causes the loss of skin color in blotches.
Last Updated: Apr 10, 2020An obstruction due to twisting or knotting of the gastrointestinal tract.
Forcefully expelling the stomach's contents out of the mouth.
A bleeding disorder caused by low levels of clotting protein, called von Willebrand factor, in the blood.
Last Updated: Jun 24, 2023A type of cancer that occurs on the outer surface area of female genitals.
Ongoing pain around the opening of the vagina for which the cause isn't known.
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A small, fleshy bump on the skin or mucous membrane caused by human papillomavirus.
Last Updated: Apr 15, 2020A condition that occurs from drinking too much water, upsetting electrolyte balances.
An accumulation of fluid in body tissues and cavities.
Illnesses acquired from untreated or contaminated water.
Last Updated: Jul 10, 2020Decreased muscle strength.
Adding pounds to the body, usually either from eating too much, not moving enough or both.
Loss of weight that may or may not be on purpose.
Last Updated: Jun 24, 2023An infection caused by a virus transmitted by mosquitoes.
An allergy to foods containing wheat.
A high-pitched whistling sound made while breathing.
A neck injury that can occur when the head suddenly moves backward and then forward.
A kidney cancer that mainly affects children ages 3 to 4.
An inherited disorder that causes too much copper to accumulate in the organs.
A syndrome in which an extra electrical pathway in the heart causes a rapid heartbeat.
An injury, damage, or trauma to the body, ranging from minor to life-threatening.
A line, crease, or a fold in the skin.
Last Updated: Oct 9, 2021Discomfort in the wrist area, usually caused by injury or long-term conditions.
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A condition that makes the skin look and feel rough, itchy, flaky or scaly.
Last Updated: Aug 31, 2023An unusually dry mouth, often caused by medication.
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A deep, involuntary breath of air, most often associated with sleepiness.
A chronic bacterial infection that affects the skin, bone, and cartilage.
A viral infection spread by a particular species of mosquito.