Bursitis Bursitis of the knee (See: Knee bursitis) Overview Bursitis (bur-SY-tis) is a painful condition that affects the small, fluid-filled sacs — called bursae (bur-SEE) — that cushion the bones,

Burns Overview Burns are tissue damage that results from heat, overexposure to the sun or other radiation, or chemical or electrical contact. Burns can be minor medical problems or life-threatening emergencies. The

Burning mouth syndrome Burning thigh pain (See: Meralgia paresthetica) Overview Burning mouth syndrome is the medical term for ongoing (chronic) or recurrent burning in the mouth without an obvious cause.

Bunions Bunyaviruses (See: Viral hemorrhagic fevers) Overview A bunion is a bony bump that forms on the joint at the base of your big toe. It forms when your big toe pushes against your next toe, forcing

Bundle branch block Overview Bundle branch block is a condition in which there’s a delay or blockage along the pathway that electrical impulses travel to make your heart beat. It sometimes makes

Bullous pemphigoid Overview Bullous pemphigoid (BUL-us PEM-fih-goid) is a rare skin condition that causes large, fluid-filled blisters. The blisters develop on areas of skin that often flex — such as

Bulimia nervosa Overview Bulimia (boo-LEE-me-uh) nervosa, commonly called bulimia, is a serious, potentially life-threatening eating disorder. People with bulimia may secretly binge — eating large amounts

Buerger’s disease Overview Buerger’s disease (thromboangiitis obliterans) is a rare disease of the arteries and veins in the arms and legs. In Buerger’s disease, your blood vessels become

Bruxism (teeth grinding) Overview Bruxism (BRUK-siz-um) is a condition in which you grind, gnash or clench your teeth. If you have bruxism, you may unconsciously clench your teeth when you’re awake

Brugada syndrome Overview Brugada (brew-GAH-dah) syndrome is a potentially life-threatening heart rhythm disorder that is sometimes inherited. People with Brugada syndrome have an increased risk of abnormal

Brucellosis Overview Brucellosis is a bacterial infection that spreads from animals to people — most often via unpasteurized milk, cheese and other dairy products. More rarely, the bacteria that cause

Bronchitis Overview Bronchitis is an inflammation of the lining of your bronchial tubes, which carry air to and from your lungs. People who have bronchitis often cough up thickened mucus, which can be

Bronchiolitis Overview Bronchiolitis is a common lung infection in young children and infants. It causes inflammation and congestion in the small airways (bronchioles) of the lung. Bronchiolitis is almost

Broken wrist/broken hand Overview A broken wrist or broken hand is a break or crack in one or more of the bones of your wrist or hand. The most common of these injuries occurs in the wrist when people

Broken toe Broken wrist (See: Broken wrist/broken hand) Overview A broken toe is a common injury that’s most frequently caused by dropping something on your foot or stubbing your toe. Usually, you