Nutrition basics
Learning Center
Aspirin allergy: What are the symptoms?
An aspirin allergy or sensitivity can cause serious symptoms.
Artificial sweeteners and other sugar substitutes
Get the facts on products that make food and drinks sweeter.
Arcus senilis: A sign of high cholesterol?
With this condition, older adults develop a gray arc around the cornea of the eyes.
Anal pain
Anal pain: Symptom — Overview covers definition, possible causes of this common symptom.
Amenorrhea
Absence of menstruation (amenorrhea) may be linked to an underlying, treatable problem. Learn about amenorrhea causes and when to seek help.
Alzheimer's stages: How the disease progresses
Alzheimer's stages — common behaviors as the disease progresses.
Alkaline water: Better than plain water?
Health claims about alkaline water abound, but plain water is usually best.
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.
Abdominal pain
Everyone experiences abdominal pain from time to time. Find out when it might be cause for concern.
10 great health foods
Add these health foods to the menu and give your diet a healthy boost.
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