Fitness basics
Learning Center
Aerobic exercise: Top 10 reasons to get physical
Need inspiration to work out? Consider the top 10 benefits of aerobic exercise.
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.
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.
Alzheimer's: Can a Mediterranean diet lower my risk?
Alzheimer's — Learn about the benefits of the Mediterranean diet.
Amenorrhea
Absence of menstruation (amenorrhea) may be linked to an underlying, treatable problem. Learn about amenorrhea causes and when to seek help.
An appointment to exercise? You bet!
If you're having trouble finding time to exercise, pull out your planner. Schedule exercise as you would schedule an important meeting or appointment. Block off the time in your calendar, and stick to it. Setting aside time for a full workout is great, but shorter bursts of exercise count too.
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.
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