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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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Chest Pain - National Library of Medicine

Having a pain in your chest can be scary. It does not always mean that you are having a heart attack. There can be many other causes, including: Other heart problems, such as angina Panic attacks Digestive problems, such as heartburn ...

Cochlear Implants - National Library of Medicine

A cochlear implant is a small, complex electronic device that can help to provide a sense of sound. People who are profoundly deaf or severely ... the outside of the body, behind the ear. A second part is surgically placed under the skin. ...

Color Blindness - National Library of Medicine

... our world in color. We enjoy looking at a lush green lawn or a red rose in full bloom. If you have a color vision defect, you may see these colors ... types are blue-yellow color vision defects and a complete absence of color vision. Most of the ...

Croup - National Library of Medicine

... larynx) and windpipe (trachea). It causes difficulty breathing, a barking cough, and a hoarse voice. The cause is usually a virus, often parainfluenza virus. Other causes include allergies ...

Dietary Fiber - National Library of Medicine

Fiber is a substance in plants. Dietary fiber is the kind you eat. It's a type of carbohydrate. You may also see it listed on a food label as soluble fiber or insoluble fiber. ...

Dizziness and Vertigo - National Library of Medicine

... your balance. Dizziness can have many different causes. A sudden drop in blood pressure or being dehydrated ... So can motion sickness. Sometimes dizziness can be a symptom of other disorders. As people get older, ...

Dwarfism - National Library of Medicine

... means that their height is under 4' 10" as an adult. They are usually of normal intelligence. ... the most common type of dwarfism. Achondroplasia is a genetic condition that affects about 1 in 15, ...

Dystonia - National Library of Medicine

Dystonia is a movement disorder that causes involuntary contractions of your muscles. These contractions result in twisting and repetitive movements. Sometimes ...

Ear Disorders - National Library of Medicine

... ear. The vibrations travel to your inner ear, a snail-shaped organ. The inner ear makes the ... sent to the brain. Your brain recognizes them as sounds. The inner ear also controls balance. A ...

Earthquakes - National Library of Medicine

... day or night. If an earthquake occurs in a populated area, it may cause property damage, injuries, and even deaths. If you live in a coastal area, there is the possibility of a ...

Eye Wear - National Library of Medicine

... choose between contacts or glasses. Either usually requires a prescription. Almost anyone can wear glasses. Contact lenses ... careful handling. Many jobs and some sports carry a risk of eye injury. Thousands of children and ...

Foreign Bodies - National Library of Medicine

If you've ever gotten a splinter or had sand in your eye, you've had experience with a foreign body. A foreign body is something that is stuck inside ... to be there. You may inhale or swallow a foreign body, or you may get one from ...



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