Strength training
Learning Center
Sclerotherapy
Learn what's involved in this treatment for varicose veins, including the risks and what to expect.
Scorpion sting
Scorpion stings are painful but rarely life-threatening. Young children and older adults are most at risk of serious complications.
Seborrheic keratosis
Learn more about the symptoms and treatments of this common, noncancerous skin growth that gradually appears as you age.
Sed rate (erythrocyte sedimentation rate)
Sed rate is a blood test that can reveal inflammatory activity in your body. It's often used to help diagnose conditions affecting your joints or muscles.
Senior sex: Tips for older men
Sex isn't just for the young. Get tips for staying active, creative and satisfied as you age.
Sex and COVID-19: Can you get COVID-19 from sexual activity?
Close contact, including sexual activity, is a risk factor for COVID-19. Find out how to lower your risk of getting the COVID-19 virus from a sexual partner.
Sex education: Talking to your teen about sex
Sex education is a parent's job. Here's help handling the challenge.
Shingles
Learn more about symptoms, causes, treatment and vaccine prevention of this painful condition affecting the nerves.
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.
Sick sinus syndrome
This heart rhythm disorder causes slow, paused or irregular heartbeats. Learn the symptoms and how it's treated.
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