Stress basics
Learning Center
Lewy body dementia
This common dementia is caused by a buildup of proteins in the brain. It affects thinking, memory and movement.
Low sperm count
Having a low sperm count can make conceiving a child difficult, but not necessarily impossible. Learn about possible causes and treatment.
MCAD deficiency
This inherited genetic disorder prevents the breakdown of certain fats needed for energy, leading to dangerously low blood sugar levels if not treated.
Malaria
Learn about the symptoms, causes, treatment, and prevention of this infectious disease transmitted to humans through mosquito bites.
Male breast cancer
Breast cancer can affect anyone. Learn about the signs and symptoms of this cancer. Treatment most often involves surgery.
Male hypogonadism
This condition affects the ability of men's bodies to produce enough testosterone or enough sperm or both.
Male infertility
Male infertility often plays a role when couples have trouble conceiving. Find out what causes male infertility and available options for treatment.
Malignant hyperthermia
This rare genetic disorder triggers a severe reaction to certain anesthesia drugs, causing rigid muscles, high fever, fast heart rate and rapid breathing.
Marfan syndrome
This inherited disorder affects the skeleton and the eyes. It can also harm the large blood vessel that carries blood from the heart to the rest of the body.
Median arcuate ligament syndrome (MALS)
Stomach pain after eating isn't always indigestion. It could be MALS, also called celiac artery compression. Know the warning symptoms.
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