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Psychology and Mental Health Dictionary Definitions - Rare disease - Psychforums.com
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Rare disease
A rare disease, sometimes known as an
orphan disease, is any disease that is not common. Typically, a rare disease has such a low prevalence in a population that a physician in a busy general practice would not expect to see more than one case a year.
Most rare diseases are genetic, and thus are present throughout the person´s entire life, even if symptoms do not appear immediately. However, many rare diseases appear early in life, and about 30% of children with rare diseases die before reaching their fifth birthdays.
No single cutoff number has been agreed upon for which a disease is considered rare. A disease may be considered rare in one part of the world, or in a particular group of people, but still be common in another.
Read and post in our
Rare disease forum.
Source :
Wikipedia.org
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