Teen health
Learning Center
Bartholin's cyst
A Bartholin's cyst is a fluid-filled lump near the vaginal opening. It's rarely serious, but when infected, it can be painful.
Bicuspid aortic valve
This condition, present at birth, affects the valve between the lower left heart chamber and the body's main artery. Know the symptoms and treatment.
Bladder exstrophy
This rare birth defect occurs when the bladder develops outside the fetus during pregnancy. The condition can be repaired with surgery.
Blocked tear duct
Watery, irritated eyes may occur when your tears can't drain normally. Learn about this common eye condition that affects newborns and sometimes, adults.
Body lice
Body lice are tiny insects that live in your clothing and feed on your blood. Find out how to treat and prevent this itchy nuisance of a bug.
Bone cancer
Bone cancer most commonly affects the long bones in the arms and legs. Some types happen mostly in children, while others affect mostly adults.
Brachial plexus injury
Learn about these nerve injuries that usually result from auto or motorcycle accidents, and find out which procedures can help restore arm function.
Breast cancer
Learn about this common cancer, including information on prevention, symptoms, diagnosis and treatment.
Breast cysts
A firm, round lump in breast tissue could be a fluid-filled cyst. Typically not cancerous, breast cysts often need no treatment.
Broken collarbone
This common injury is usually the result of falling, playing sports or being in a traffic accident.
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