Sleep
Learning Center
Shigella infection
Shigella infection is an intestinal infection that causes diarrhea. Learn how to recognize, treat and prevent the spread of this contagious condition.
Sick sinus syndrome
This heart rhythm disorder causes slow, paused or irregular heartbeats. Learn the symptoms and how it's treated.
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.
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.
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.
Snoring
Is the sound of snoring disrupting sleep in your household? Find out causes and treatment options for this common problem.
Sore throat
Find out what causes this common affliction, when to see a doctor and what you can do to get relief from a sore throat.
Spider bites
Learn more about prevention, symptoms, complications and treatment of spider bites, which are usually harmless.
Spina bifida
Learn about this condition in which an unborn baby's spine and spinal cord don't form properly. Surgery during pregnancy may be a treatment option.
Strep throat
Learn more about the symptoms, causes and treatment of this throat bacterial infection in children and adults.
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