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An intrauterine device (IUD) is a method of birth control that is placed inside the uterus to prevent pregnancy. All IUDs have a

Islet cells are located in the pancreas and make hormones, including insulin, glucagon, somatomammotropin, and pancreatic

An abnormal heartbeat (arrhythmia) is any variation in the normal heartbeat. Abnormal heartbeats occur when the heart has an

Irritable bowel syndrome (IBS) is a digestion problem that causes episodes of belly pain, cramping or bloating, and diarrhea or

Exposure to lead paint (lead-based paint), which was widely used in many homes and apartments before 1978, can damage the body's

Legionnaires' disease is an infection of the lungs (pneumonia) caused by a type of bacteria called Legionella pneumophila. People

The lymph system is a network of vessels and organs throughout the body. This network carries a fluid that contains special white

Leukemia is a type of cancer that happens when cells in your bone marrow become leukemia cells. Over time, these cells crowd out

Lightheadedness makes a person feel like they are about to faint or pass out. It is caused by a momentary drop in blood pressure

Lipid disorders that are inherited are called familial or genetic lipid disorders. These disorders are problems that affect the