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Silent heart attack: What are the risks?
This type of heart attack occurs with few, if any, symptoms. Find out more.
Sickle cell anemia
Learn about the symptoms, causes and treatment of this inherited blood disorder that, in the United States, is more common among Black people.
Sick sinus syndrome
This heart rhythm disorder causes slow, paused or irregular heartbeats. Learn the symptoms and how it's treated.
Sibling rivalry: Helping your children get along
Promote healthy sibling relationships by respecting your children's unique needs, avoiding comparisons and setting ground rules.
Shingles vaccine: Can I transmit the vaccine virus to others?
A shingles vaccine uses only part of the varicella-zoster virus, so you can't infect others.
Shigella infection
Shigella infection is an intestinal infection that causes diarrhea. Learn how to recognize, treat and prevent the spread of this contagious condition.
Shellfish allergy
It's possible to be allergic to some types of shellfish without reacting to other types. Learn more about this common food allergy.
Sex education: Talking to your teen about sex
Sex education is a parent's job. Here's help handling the challenge.
Sex and COVID-19: Can you get COVID-19 from sexual activity?
Find out whether COVID-19 can be spread during sexual activity and how to reduce your risk of getting the virus from a sexual partner.
Severe acute respiratory syndrome (SARS)
Learn about this contagious and sometimes fatal respiratory illness. The last known infection was reported in 2004.
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