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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.
Blood in urine (hematuria)
Lots of things can cause bloody urine. Some are serious problems, and others are harmless. Find out why it's always important to get a checkup.
Body dysmorphic disorder
This mental disorder causes persistent, intense focus, shame and anxiety over perceived body defects, often resulting in many cosmetic procedures as a fix.
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.
Boils and carbuncles
Learn about symptoms, causes, treatment and prevention of these painful pus-filled infections that cause bumps under your skin or leaking sores.
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.
Bone metastasis
Learn about the symptoms and causes of cancer that spreads to the bones. Find out about treatments, including medications, radiation and surgery.
Bone spurs
Joint damage due to osteoarthritis is the most common cause of these bony growths.
Borderline personality disorder
This mental health condition affects how you see yourself. It includes unstable and intense relationships, extreme emotions, and impulsiveness.
Botulism
This rare but serious condition can be caused by bacteria that have contaminated food or a wound. Learn more about how to prevent botulism.
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