Nutrition basics
Learning Center
Binge-eating disorder
People with this condition often don't feel able to stop eating and may eat larger than usual amounts of food. Learn about symptoms and treatment.
Bipolar disorder
This mental health condition causes extreme mood swings that include emotional highs, called mania, and lows, known as 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.
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