Skin care
Learning Center
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.
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.
Skin care: 5 tips for healthy skin
Skin care gimmicks abound — but don't fall for the hype. Get healthy looking skin with these simple tips.
Sickle cell anemia
Learn about the symptoms, causes and treatment of this inherited blood disorder that, in the United States, is more common among Black people.
Sick sinus syndrome
This heart rhythm disorder causes slow, paused or irregular heartbeats. Learn the symptoms and how it's treated.
Sibling rivalry: Helping your children get along
Promote healthy sibling relationships by respecting your children's unique needs, avoiding comparisons and setting ground rules.
Shigella infection
Shigella infection is an intestinal infection that causes diarrhea. Learn how to recognize, treat and prevent the spread of this contagious condition.
Shellfish allergy
It's possible to be allergic to some types of shellfish without reacting to other types. Learn more about this common food allergy.
Shaving hair: Does shaved hair grow back thicker?
Contrary to popular belief, shaving unwanted hair doesn't make it grow back thicker.
Severe acute respiratory syndrome (SARS)
Learn about this contagious and sometimes fatal respiratory illness. The last known infection was reported in 2004.
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