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The immune system is the body's defense against foreign substances, such as bacteria or viruses, that may be harmful. An

The auditory nerve carries sound impulses from the inner ear to the brain. The brain "unscrambles" the auditory signals to make

Attention deficit hyperactivity disorder (ADHD) is a condition that makes it hard to pay attention and focus on tasks. People who

Atrophic vaginitis occurs when the lining of the vagina becomes thin and fragile because of decreased estrogen levels, usually

Atrioventricular septal defect is an opening between all four chambers of the heart that is present at birth (congenital heart

Atrial fibrillation (say "AY-tree-uhl fih-bruh-LAY-shun") is a type of irregular heartbeat (arrhythmia) in which the heart's upper

Eczema, also called atopic dermatitis, is a skin problem. It causes dry skin, intense itching, and a raised rash. Sometimes the

Anxiety is an uncomfortable feeling of fear, uneasiness, or concern that something bad may happen. Anxiety can cause physical

Beer, wine, and liquor (distilled spirits) are alcoholic beverages. The following common alcoholic beverages contain equal amounts

Acanthosis nigricans is a common skin condition that causes patches of thicker skin that are usually darker than the nearby skin