Fitness basics
Learning Center
Soft tissue sarcoma
This rare type of cancer can begin in the muscles, fat, blood vessels, nerves, tendons and the lining of joints. Treatment usually includes surgery.
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.
Silicone breast implants: What happens if they rupture?
Understand the problems that may happen when a silicone breast implant leaks.
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.
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.
Severe acute respiratory syndrome (SARS)
Learn about this contagious and sometimes fatal respiratory illness. The last known infection was reported in 2004.
Separation anxiety disorder
This is intense or prolonged separation anxiety that interferes with school or other daily activities or includes panic attacks. Learn about treatment.
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