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Bilirubin is a substance produced by the breakdown of old red blood cells and hemoglobin, the protein in red blood cells that

Bronchoscopy is a procedure doctors use to look at the airways leading to the lungs. During bronchoscopy, a thin, lighted

Bronchodilators are medicines that relax (dilate) the airways of the lungs (bronchial tubes). This makes it easier for a person to

A brain tumor is a growth in the brain that leads to increased pressure inside the skull and the destruction and compression of

Body mass index (BMI) is a number based on a person's weight and height that provides a way to estimate the effect of weight on

Milk ducts in the breast may become blocked during breastfeeding when the breasts are full and not emptied regularly or thoroughly

Blepharitis is an inflammation or infection of the eyelid. It is often caused by bacteria (usually staphylococcus) or related to a

Bleeding disorders prevent blood from clotting normally when a person is cut or injured. When the blood does not clot normally

Bulimia (say "boo-LEE-mee-uh") is an eating disorder that causes people to eat a large amount of food in a short time (binge)

A brain abscess is a pocket of infection that forms in the brain. Depending on its size and location, a brain abscess may cause