Medications
Learning Center
Airplane ear
That fullness in your ear when on an airplane that's climbing or descending results from uneven air pressure between your middle ear and the environment.
Albinism
In this group of inherited disorders, the body makes little or no melanin, a pigment that determines hair, skin and eye color and vision development.
Allergies
Allergy symptoms can range from mild to severe, even life-threatening. Most allergies can't be cured, but treatments can help.
Allergy skin tests
Considering skin testing for your allergies? Learn about the risks, results and what to expect during testing.
Amenorrhea
Absence of menstruation (amenorrhea) may be linked to an underlying, treatable problem. Learn about amenorrhea causes and when to seek help.
Anaphylaxis
Anaphylaxis, a severe allergic reaction, is an emergency. Learn who's at risk, what to watch for and what to do when it occurs.
Angelman syndrome
Learn about this genetic disorder that causes developmental delays, problems with speech and other symptoms.
Anorexia nervosa
People with this eating disorder have a very low body weight, an intense fear of gaining weight and a flawed way of seeing their body.
Antibiotics and alcohol
Alcohol doesn't make antibiotics less effective. But it's still a good idea not to drink alcohol while taking antibiotics.
Antibiotics: Are you misusing them?
The overuse of antibiotics creates antibiotic-resistant germs. Protect yourself and others by using antibiotics wisely.
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