A disease is rare if fewer than 200,000 people in the United States have it. There are close to 7,000 rare diseases and about 25 million people in the U.S. have one. Many rare diseases are caused by changes in genes and are called genetic diseases.
National Institutes of Health Office of Rare Diseases
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Date last updated: 20 November 2008 Topic last reviewed: 20 November 2008 |