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Vasovagal syncope is fainting caused by a complex nerve and blood vessel reaction in the body. It's the most common cause of fainting. Unlike other causes of fainting, it's not a sign of a problem with the heart or brain.

ARVC is a rare genetic disease of the heart muscle. It replaces normal heart muscle with fatty fibrous tissue, mainly in the right ventricle.

Read on to learn about ovarian cysts, including treatment when one ruptures and follow-up care.

Vasovagal syncope is fainting caused by a complex nerve and blood vessel reaction in the body. It's the most common cause of fainting. Unlike other causes of fainting, it's not a sign of a problem with the heart or brain.

These images show how to safely sit using a walker.

Aniridia means lack of an iris. It is a rare disorder in which the iris of the eye is partly or completely missing. Here are details on treatments and complications.

Aortic valve regurgitation is when the aortic valve leaks. In many cases, mild to moderate aortic valve regurgitation just needs to be monitored. More severe cases often need surgery. Here's what you need to know about treatment.

Aspiration is when something enters the airway or lungs by accident. It may be food, liquid, or some other material. This can cause serious health problems, such as pneumonia. Aspiration can happen when a person has dysphagia. It can also happen if a child has gastroesophageal reflux disease.

Your carotid dissection may need to be treated in a hospital. Treatment choices depend on your age, overall health, and symptoms.