Infant health
Learning Center
Spitting up in babies: What's normal, what's not
Spitting up in babies is common — and usually nothing to worry about.
Stereotactic body radiotherapy
This type of radiotherapy uses highly targeted radiation beams to treat tumors in all parts of the body.
Stomach flu: How long am I contagious?
Depending on which virus causes your stomach illness, you can be contagious from a few days to two weeks or more.
Strategies to prevent heart disease
Learn strategies you can practice now to protect your heart.
Strength training: OK for kids?
It's good for kids to build strength as long as form and safety come first.
Strep throat
Learn more about the symptoms, causes and treatment of this throat bacterial infection in children and adults.
Stuttering
Stuttering, sometimes called stammering, is a speech condition that involves problems with rhythm and flow when speaking.
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.
Sun damage
See photos of common skin conditions that are caused by too much time in the sun.
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.
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