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Strep throat
Learn more about the symptoms, causes and treatment of this throat bacterial infection in children and adults.
Stomach polyps
These masses of cells that form on your stomach lining usually don't cause symptoms. Learn what causes them and when to be concerned.
Stomach cancer
Stomach cancer, which is also called gastric cancer, is cancer that begins in the stomach. Learn about symptoms, causes, detection and treatments.
Stevens-Johnson syndrome
Learn more about the causes of this rare disorder of the skin and mucous membranes, its early signs, and whether it's preventable.
Staph infections
Learn about the symptoms, causes and treatment of these potentially lethal infections.
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.
Squamous cell carcinoma of the skin
This common skin cancer usually looks like a bump or a scaly sore. Learn about symptoms and treatment options, including freezing, lasers and surgery.
Sprains
A sprain is a stretching or tearing of ligaments — the tough bands of tissue that connect two bones together in your joints. Ice and elevation can help.
Sprained ankle
Sprained ankle — Injury to a ligament of the ankle can usually be treated with at-home care and appropriate exercises to get you back on your feet.
Spontaneous coronary artery dissection (SCAD)
A torn blood vessel in the heart can cause a heart attack. Learn about the diagnosis and treatment of this medical emergency.
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