Healthy aging: Over 50
Learning Center
Sunburn
Learn more about how UV rays harm your skin and what you can do for symptom sunburn relief and how to protect yourself from sun exposure.
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.
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.
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.
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