Eye care
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.
Allergy medications and pregnancy: What's safe?
Find out what medicines can help you manage allergies while you're pregnant.
Allergy skin tests
Considering skin testing for your allergies? Learn about the risks, results and what to expect during testing.
Alzheimer's: Managing sleep problems
Alzheimer's sleep problems affect both you and your loved one. Consider tips for coping.
Amenorrhea
Absence of menstruation (amenorrhea) may be linked to an underlying, treatable problem. Learn about amenorrhea causes and when to seek help.
Amniocentesis
Find out about this prenatal test that checks the fluid surrounding the baby during pregnancy.
Amputation and diabetes: How to protect your feet
Find out who's at risk and what you can do to protect your feet from diabetes complications.
Anal fissure
Learn what causes a tear in the anus and how to prevent or treat this often painful condition.
Angelman syndrome
Learn about this genetic disorder that causes developmental delays, problems with speech and other symptoms.
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