Fitness basics
Learning Center
Hepatitis B
This highly contagious virus can cause long-lasting problems if it goes untreated. Learn about the symptoms, treatment and prevention of this serious liver infection.
Hepatitis A
This contagious liver infection is caused by a virus. Learn more about its symptoms, treatment and prevention, including the hepatitis A vaccine.
Sleepwalking
People who get up and walk around while sleeping may not need treatment. But if it happens often, it could be a sleep disorder that needs treatment.
Nightmare disorder
Nightmare disorder involves disturbing or scary dreams that awaken you, causing distress or preventing adequate sleep.
Sleep terrors (night terrors)
These are times of screaming or crying, intense fear, and sometimes waving arms and legs during sleep. The person often sits up in bed, looking scared.
Social anxiety disorder (social phobia)
Learn more on this disorder where everyday interactions cause significant worry and self-consciousness because you fear being judged negatively by others.
Stuttering
Stuttering, sometimes called stammering, is a speech condition that involves problems with rhythm and flow when speaking.
Acne
Learn more about this common skin condition, including causes, treatments and simple skin care steps you can do at home to help control it.
Kleptomania
If you have this impulse control disorder, you can't resist urges to steal items that you generally don't really need and that usually have little value.
Tuberous sclerosis
This uncommon genetic disorder causes tumors that are not cancer. These tumors are unexpected overgrowths of tissue in different parts of the body.
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