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Seborrheic dermatitis is a skin condition that causes a rash with greasy, flaky skin patches. It often occurs on the scalp and

A serious head injury occurs when the brain hits against the inside of the skull with enough force to cause brain damage. A

Secondary enuresis is accidental bed-wetting in the day or night by a child who has had bladder control for at least 6 to 12

Secondhand smoke is tobacco smoke that affects a nonsmoker. Secondhand smoke can come directly from a cigarette or other lit

Secondary progressive MS happens in some people who had relapsing-remitting MS first. It may or may not cause attacks (relapses)

Semen is a thick, cloudy, white fluid that contains sperm. Semen is usually released, or ejaculated, from the penis during a

Seizures are sudden bursts of abnormal electrical activity in the brain that may affect a person's muscle control, movement

The seminal vesicles are two sac-shaped structures that produce part of the thick fluid (semen) that contains sperm. The vesicles

Sedatives and tranquilizers are medicines that have a calming effect. Generally, sedatives and tranquilizers depress or slow down

Septic arthritis is an infection in a joint. The joint is often red, hot, swollen, and tender. The joint may become infected with