Fitness basics
Learning Center
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.
Spider bites
Learn more about prevention, symptoms, complications and treatment of spider bites, which are usually harmless.
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.
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.
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
This infection of the intestine causes diarrhea. Learn the symptoms, treatments and ways to help prevent it.
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.
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