Fitness
Learning Center
Bipolar disorder
Bipolar disorder causes extreme mood swings that include emotional highs (mania or hypomania) and lows (depression).
Bird flu (avian influenza)
Flu viruses in other animals, such as birds, may be a risk to people. Learn more about the symptoms, causes, prevention and treatment for bird flu in people.
Bird flu (avian influenza)
Flu viruses in other animals, such as birds, may be a risk to people. Learn more about the symptoms, causes, prevention and treatment for bird flu in people.
Bird flu (avian influenza)
Flu viruses in other animals, such as birds, may be a risk to people. Learn more about the symptoms, causes, prevention and treatment for bird flu in people.
Black hairy tongue
This condition gives the tongue a dark, furry look. It results from a buildup of dead skin cells on the many tiny, rounded bumps on the tongue's surface.
Bladder cancer
Blood in the urine (hematuria) sometimes is a sign of bladder cancer. Learn about other bladder cancer signs and symptoms and explore treatment options.
Bladder stones
Minerals in your urine can crystallize if you have trouble emptying your bladder completely, creating this potentially painful condition.
Blastocystis hominis
This microscopic organism is a parasite that can live in your digestive system. Whether it causes digestive problems isn't clear.
Blepharitis
This often chronic eyelid condition can be difficult to treat. It might be uncomfortable, but it doesn't usually damage eyesight and isn't contagious.
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.
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