Nutrition basics
Learning Center
Alkaline water: Better than plain water?
Health claims about alkaline water abound, but plain water is usually best.
Allergies
Allergy symptoms can range from mild to severe, even life-threatening. Most allergies can't be cured, but treatments can help.
Allergies and asthma: They often occur together
Allergies and asthma? Find out how to control both conditions.
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 and dementia: What's the difference?
The terms 'Alzheimer's disease' and 'dementia' are often used to mean the same thing — but here's the real difference between them.
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.
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.
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