Nutrition basics
Learning Center
Alcohol use: Weighing risks and benefits
Drinking alcohol in any amount is a health risk that increases with each drink you have. The risk peaks with heavy drinking, including binge drinking, which carries serious health risks.
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.
Allergy skin tests
Considering skin testing for your allergies? Learn about the risks, results and what to expect during testing.
Alzheimer's or depression: Could it be both?
Alzheimer's and depression have some similar symptoms. Proper treatment improves quality of life.
Alzheimer's stages: How the disease progresses
Alzheimer's stages — common behaviors as the disease progresses.
Amenorrhea
Absence of menstruation (amenorrhea) may be linked to an underlying, treatable problem. Learn about amenorrhea causes and when to seek help.
Anal pain
Anal pain: Symptom — Overview covers definition, possible causes of this common symptom.
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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