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Atrial flutter is an abnormal heart rhythm that causes the atria to beat more quickly than they should.

An AED is a small, portable, battery-powered machine with a computer in it. The machine detects heart activity. It can give an electric shock to someone if needed.

Anorexia nervosa (or simply anorexia) is an eating disorder that causes people to obsess about their weight and food. People who suffer with this behavior problem have a distorted body image. They see themselves as overweight even when their weight is dangerously low.

Alzheimer disease most commonly affects older adults. But it can also affect people in their 30s or 40s. When Alzheimer disease occurs in someone younger than age 65, it is known as early-onset (or younger-onset) Alzheimer disease.

Ascites is a condition that occurs when fluid collects in spaces in your belly. It can be painful and keep you from moving around comfortably. Ascites can set the stage for an infection in your belly. Fluid may also move into your chest and surround your lungs. This makes it hard to breathe.

Much back pain in pregnancy is related to the strain on your back from the weight of your growing baby. Using correct posture can help prevent and even relieve some of the pain.

Arthroscopy is a minimally-invasive procedure used to diagnose and treat conditions affecting joints. The doctor can directly view the internal structures of a joint using an instrument called an arthroscope. An arthroscope is a small, tube shaped instrument that is used to look inside a joint.

Leukemia is cancer that starts in the bone marrow. When a person has leukemia, the body makes too many abnormal blood cells. Learn more about symptoms, diagnosis, and treatments.

The anus is the last part of the digestive tract. Most anal cancers start in the cells that make the inside lining of the anus. Learn more about symptoms, diagnosis, and treatments.