Strength training
Learning Center
Silent heart attack: What are the risks?
This type of heart attack occurs with few, if any, symptoms. Find out more.
Sleep apnea
Snoring loudly could be an indication of sleep apnea, a disorder in which breathing stops and starts repeatedly during sleep.
Small vessel disease
Also called coronary microvascular disease, this type of heart disease can be hard to detect. Know the symptoms and how it's diagnosed and treated.
Smokeless tobacco products
Learn the risks of using products such as chewing tobacco, snuff and snus.
Stage 4 prostate cancer
Find out about diagnosis and treatment of this cancer that has spread to the lymph nodes or other parts of the body.
Stool DNA test
Learn about this noninvasive colon cancer screening test that can detect DNA changes in cells collected from a stool sample.
Strength training: Get stronger, leaner, healthier
Strength training can help you look good — and feel even better.
Stress incontinence
Movement such as coughing, laughing and running can cause urine to leak for people with this condition. Learn about treatments and self-care.
Stress symptoms: Effects on your body and behavior
Learn how stress symptoms can affect your health so that you can take action.
Sun damage
See photos of common skin conditions that are caused by too much time in the sun.
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