Nutrition basics
Learning Center
Spirometry
This common test shows how well your lungs work and helps diagnose conditions that affect the ability to breathe.
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.
Sperm: How long do they live after ejaculation?
After ejaculation, the life span of sperm depends on the circumstances.
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.
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.
Sodium: How to tame your salt habit
Find out which foods have lots of this mineral and get tips on how to cut back.
Small bowel prolapse (enterocele)
Learn more about this condition also called a vaginal hernia that happens when the small bowel pushes down onto the top of the vagina.
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.
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