Skin care
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.
Suicide and suicidal thoughts
Suicide can be prevented. Learn suicide warning signs and how to reach out for immediate help and professional treatment.
Sudden infant death syndrome (SIDS)
Learn about the unexplained death of a young baby who seems healthy.
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.
Strep throat in young children: A common diagnosis?
Strep throat in young children is uncommon, but it's possible. Learn about symptoms.
Strep throat
Learn more about the symptoms, causes and treatment of this throat bacterial infection in children and adults.
Spontaneous coronary artery dissection (SCAD)
A torn blood vessel in the heart can cause a heart attack. Learn about the diagnosis and treatment of this medical emergency.
Spitting up in babies: What's normal, what's not
Spitting up in babies is common — and usually nothing to worry about.
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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