Fitness basics
Learning Center
Sex during pregnancy: What's OK, what's not
Questions about sex during pregnancy? Here's what you need to know.
Sex education: Talking to your teen about sex
Sex education is a parent's job. Here's help handling the challenge.
Shaken baby syndrome
Understand why shaking a baby can cause brain damage, and why getting immediate medical care can save a child’s life or prevent serious health problems.
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.
Signs of labor: Know what to expect
Learn what you can expect as your due date approaches and your body prepares for delivery.
Silent heart attack: What are the risks?
This type of heart attack occurs with few, if any, symptoms. Find out more.
Silicone breast implants: What happens if they rupture?
Understand the problems that may happen when a silicone breast implant leaks.
Small bowel prolapse (enterocele)
Learn more about this condition also called a vaginal hernia that happens when the small bowel pushes down onto the top of the vagina.
Smokeless tobacco products
Learn the risks of using products such as chewing tobacco, snuff and snus.
Sperm: How long do they live after ejaculation?
After ejaculation, the life span of sperm depends on the circumstances.
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