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Learning Center
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.
Anal fissure
Learn what causes a tear in the anus and how to prevent or treat this often painful condition.
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.
Amenorrhea
Absence of menstruation (amenorrhea) may be linked to an underlying, treatable problem. Learn about amenorrhea causes and when to seek help.
Alzheimer's: Managing sleep problems
Alzheimer's sleep problems affect both you and your loved one. Consider tips for coping.
Allergy skin tests
Considering skin testing for your allergies? Learn about the risks, results and what to expect during testing.
Allergies
Allergy symptoms can range from mild to severe, even life-threatening. Most allergies can't be cured, but treatments can help.
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.
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.
Agoraphobia
Agoraphobia is an anxiety disorder in which you fear and avoid public places or situations where you might feel panicked, trapped, helpless or embarrassed.
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