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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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CT Scans - National Library of Medicine

Computed tomography (CT) is a type of imaging. It uses special x-ray equipment to make cross-sectional pictures of your body. Doctors use CT scans to look for: ...

Diarrhea - National Library of Medicine

... contaminated food or water.What other symptoms might I have with diarrhea? Other possible symptoms of diarrhea ... and people with weakened immune systems.When do I need to see a health care provider for ...

Headache - National Library of Medicine

Almost everyone has had a headache. Headache is the most common form of pain. It's a major reason people miss days at work or school or visit the doctor. The ...

Hemorrhoids - National Library of Medicine

... hemorrhoids may cause pain and discomfort.How can I treat hemorrhoids at home? You can most often ... swelling, and itching of external hemorrhoids. When do I need to see a health care provider for ...

HIV Medicines - National Library of Medicine

... more different types of HIV medicines.When do I need to start taking HIV medicines? It's important ... months after infection with HIV) What else do I need to know about taking HIV medicines? You ...

Menopause - National Library of Medicine

Menopause is the time in a woman's life when her period stops. It usually occurs naturally, most often after age 45. Menopause happens because the woman's ovaries ...