Aerobic exercise
Learning Center
Sun damage
See photos of common skin conditions that are caused by too much time in the sun.
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 symptoms: Effects on your body and behavior
Learn how stress symptoms can affect your health so that you can take action.
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.
Stage 4 prostate cancer
Find out about diagnosis and treatment of this cancer that has spread to the lymph nodes or other parts of the body.
Spirometry
This common test shows how well your lungs work and helps diagnose conditions that affect the ability to breathe.
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