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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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Sciatica - National Library of Medicine

Sciatica is a symptom of a problem with the sciatic nerve, the largest nerve in the body. It controls muscles in the back of your knee and ... side of your body. Causes of sciatica include: A ruptured intervertebral disk Narrowing of the spinal canal ...

Scoliosis - National Library of Medicine

Scoliosis causes a sideways curve of your backbone, or spine. These curves are often S- or C-shaped. Scoliosis is most common ... get screening for scoliosis at school or during a checkup. If it looks like there is a ...

Seasonal Affective Disorder - National Library of Medicine

Seasonal affective disorder (SAD) is a type of depression that comes and goes with the seasons. It usually starts in the late fall and early winter and ... in the spring or summer, but that is a lot less common. Symptoms of SAD may include: ...

Shock - National Library of Medicine

... be life-threatening. It often happens along with a serious injury. There are several kinds of shock. Hypovolemic shock happens when you lose a lot of blood or fluids. Causes include internal ...

Skin Aging - National Library of Medicine

Your skin changes as you age. You might notice wrinkles, age spots and dryness. Your skin also becomes thinner and loses fat, making ... might take longer to heal, too. Sunlight is a major cause of skin aging. You can protect ...

Tubal Ligation - National Library of Medicine

Tubal ligation (getting your "tubes tied") is a type of surgery. It prevents a woman from getting pregnant. It is a permanent form of birth control, and is effective right away. ...

Underage Drinking - National Library of Medicine

... poor decisions about engaging in risky behavior, such as drinking and driving or unprotected sex Increases the ... sexual assault Can lead to other problems, such as trouble in school May interfere with brain development ...

Volcanoes - National Library of Medicine

A volcano is a vent in the Earth's crust. Hot rock, steam, poisonous gases, and ash reach the Earth's surface when a volcano erupts. An eruption can also cause earthquakes, ...

A1C - National Library of Medicine

A1C is a blood test for type 2 diabetes and prediabetes. It measures your average blood glucose, or blood sugar, level ... in combination with other diabetes tests to make a diagnosis. They also use the A1C to see ...

Adhesions - National Library of Medicine

... have slippery surfaces so they can shift easily as the body moves. Adhesions cause tissues and organs ... completely block the intestines, they cause symptoms such as: Severe abdominal pain or cramping Vomiting Bloating An ...

Adrenal Gland Cancer - National Library of Medicine

... respond to stress and has many other functions. A number of disorders can affect the adrenal glands, ... in the outer part of the gland Neuroblastoma, a type of childhood cancer Pheochromocytoma - a rare tumor ...

Anal Disorders - National Library of Medicine

... Swelling How are anal disorders diagnosed? To make a diagnosis, your health care provider will ask about ... your anus for anything that looks abnormal. Perform a digital rectal exam (DRE). For this exam, your ...

Antioxidants - National Library of Medicine

... including fruits and vegetables. They are also available as dietary supplements. Examples of antioxidants include: Beta-carotene Lutein Lycopene Selenium Vitamin A Vitamin C Vitamin E Vegetables and fruits are ...

Asbestos - National Library of Medicine

Asbestos is the name of a group of minerals with long, thin fibers. It was once used widely as insulation. It also occurs in the environment. Asbestos ... you breathe in high levels of asbestos over a long period of time, the fibers can build ...



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