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MedlinePlus is a service of the National Library of Medicine (NLM), the world's largest medical library, which is part of the National Institutes of Health (NIH). It was built as an online health information resource for patients and their families and friends.

MedlinePlus presents high-quality, easy to understand, relevant health and wellness information that is trusted.

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Steroids - National Library of Medicine

You may have heard of anabolic steroids, which can have harmful effects. But there's another type of steroid - sometimes called a corticosteroid - that treats ...

Stillbirth - National Library of Medicine

If a woman loses a pregnancy after she's past her 20th week, it's called a stillbirth. Stillbirths are due to natural causes. They can happen before delivery ...

Stress - National Library of Medicine

What is stress? Stress is how your brain and body respond to a challenge or demand. When you are stressed, your body releases certain hormones. Hormones ...

Stroke - National Library of Medicine

What is a stroke? A stroke happens when there is a loss of blood flow to part of the brain. Your brain cells cannot get the oxygen and nutrients they ...

Suicide - National Library of Medicine

What is suicide? Suicide is the taking of one's own life. It is a death that happens when someone harms themselves because they want to end their life. ...

Surgery - National Library of Medicine

There are many reasons to have surgery. Some operations can relieve or prevent pain. Others can reduce a symptom of a problem or improve some body function. ...

Sweat - National Library of Medicine

Sweat is a clear, salty liquid produced by glands in your skin. Sweating is how your body cools itself. You sweat mainly under your arms and on your feet and ...

Syphilis - National Library of Medicine

Syphilis is a sexually transmitted infection (STI) caused by bacteria. It infects the genital area, lips, mouth, or anus of both men and women. You usually get ...



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