Fitness basics
Learning Center
Silicone breast implants: What happens if they rupture?
Understand the problems that may happen when a silicone breast implant leaks.
Silent heart attack: What are the risks?
This type of heart attack occurs with few, if any, symptoms. Find out more.
Signs of labor: Know what to expect
Learn what you can expect as your due date approaches and your body prepares for delivery.
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.
Sick baby? When to seek medical attention
Is it time to call your baby's doctor or seek emergency care? Follow these guidelines for treating a sick baby.
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.
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.
Sex education: Talking to your teen about sex
Sex education is a parent's job. Here's help handling the challenge.
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