Nutrition basics
Learning Center
Sudden death in young people: Heart problems often blamed
Sudden cardiac death in young people is rare. It's not the same as sudden cardiac arrest. Learn about the risk factors and causes and when screening is needed.
Stuttering
Stuttering, sometimes called stammering, is a speech condition that involves problems with rhythm and flow when speaking.
Stress fractures
Stress fractures are tiny cracks in bones often caused by overuse or osteoporosis. Learn how to prevent and treat them.
Strep throat
Learn more about the symptoms, causes and treatment of this throat bacterial infection in children and adults.
Strength training: OK for kids?
It's good for kids to build strength as long as form and safety come first.
Stereotactic body radiotherapy
This type of radiotherapy uses highly targeted radiation beams to treat tumors in all parts of the body.
Stages of labor and birth: Baby, it's time!
Find out what happens during the different stages of labor and birth.
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.
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