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Small cell, large cell cancer: What this means

Cancer cells are classified by how they look under a microscope. Learn common terms used…

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Small intestinal bacterial overgrowth (SIBO)

Small intestinal bacterial overgrowth (SIBO) can occur when excess bacteria builds up in the small…

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Small lymphocytic lymphoma

Find out more about the symptoms, diagnosis and treatment of this type of non-Hodgkin lymphoma.

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Small vessel disease

Also called coronary microvascular disease, this type of heart disease can be hard to detect.…

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Smallpox

Learn about the symptoms, causes and vaccine prevention of this contagious, disfiguring and sometimes fatal…

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Smokeless tobacco products

Learn the risks of using products such as chewing tobacco, snuff and snus.

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Snakebites: First aid

If a snake bites you, call 911 or your local emergency number right away, and…

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Snoring

Is the sound of snoring disrupting sleep in your household? Find out causes and treatment…

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Social anxiety disorder (social phobia)

Learn more on this disorder where everyday interactions cause significant worry and self-consciousness because you…

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Sodium: How to tame your salt habit

Find out which foods have lots of this mineral and get tips on how to…

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Soft palate cancer

Learn about the symptoms of this type of cancer that forms in the back of…

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Soft tissue sarcoma

This rare type of cancer can begin in the muscles, fat, blood vessels, nerves, tendons…

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Solid foods: How to get your baby started

Follow these tips for starting your baby on solid foods.

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Solitary fibrous tumor

This rare type of tumor most often occurs near the lungs. Surgery is usually the…

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Solitary rectal ulcer syndrome

This rare condition is often linked to long-lasting constipation. Learn more about symptoms and treatment.

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Somatic symptom disorder

Learn about symptoms, causes and treatment of this condition, which is linked with major emotional…

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Sore throat

Find out what causes this common affliction, when to see a doctor and what you…

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South Beach Diet

This eating plan features foods with complex carbohydrates, lean protein and healthy fats.

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Soy: Does it reduce cholesterol?

Soy alone doesn't lower cholesterol enough to make a big difference. But eating soy can…

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Soy: Does it worsen hypothyroidism?

For most people with hypothyroidism, it's okay to have some soy. But the timing makes…

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Spastic colon: What does it mean?

This term is sometimes used to refer to irritable bowel syndrome (IBS) — but how…

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Spasticity management for spinal cord injury

Muscle overactivity can be a side effect of spinal cord injury or illness. Treatment may…

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Specific phobias

These are extreme fears of objects or situations that pose little or no danger. There…

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SPECT scan

SPECT scans use radioactive tracers and special cameras to create images of your internal organs.…

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Sperm: How long do they live after ejaculation?

After ejaculation, sperm typically can live for several days.

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Sperm morphology: What does it mean?

The size and shape of sperm can be one part of not being fertile.

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Spermatocele

Learn more about this noncancerous testicular disorder that may require surgery if it's causing discomfort.…

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Spider bites

Learn more about prevention, symptoms, complications and treatment of spider bites, which are usually harmless.

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Spider bites: First aid

How to administer first aid for a spider bite.

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Spina bifida

Learn about this condition in which an unborn baby's spine and spinal cord don't form…

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