These are times of screaming or crying, intense fear, and sometimes waving arms and legs during sleep. The person often sits up in bed, looking scared.
Disease
Sleepwalking
People who get up and walk around while sleeping may not need treatment. But if it happens often, it could be a sleep disorder that needs treatment.
Disease
Small bowel cancer
This type of cancer starts in the small intestine. Find out more about symptoms and treatments, including surgery, chemotherapy and targeted therapy.
Disease
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.
Disease
Small intestinal bacterial overgrowth (SIBO)
Small intestinal bacterial overgrowth (SIBO) can occur when excess bacteria builds up in the small intestine. Learn more about this bowel disorder.
Disease
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.
Disease
Smallpox
Learn about the symptoms, causes and vaccine prevention of this contagious, disfiguring and sometimes fatal viral disease.
Disease
Snoring
Is the sound of snoring disrupting sleep in your household? Find out causes and treatment options for this common problem.
Disease
Social anxiety disorder (social phobia)
Learn more on this disorder where everyday interactions cause significant worry and self-consciousness because you fear being judged negatively by others.
Disease
Soft palate cancer
Learn about the symptoms of this type of cancer that forms in the back of the mouth. Treatment options might include surgery, radiation and chemotherapy.
Disease
Soft tissue sarcoma
This rare type of cancer can begin in the muscles, fat, blood vessels, nerves, tendons and the lining of joints. Treatment usually includes surgery.
Disease
Solitary fibrous tumor
This rare type of tumor most often occurs near the lungs. Surgery is usually the treatment.