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February 9, 2010
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Prader-Willi Syndrome

What is Prader-Willi syndrome?

Prader-Willi syndrome is a complex genetic condition that affects many parts of the body. In infancy, this condition is characterized by weak muscle tone (hypotonia), feeding difficulties, poor growth, and delayed development. Beginning in childhood, affected individuals develop an insatiable appetite and chronic overeating (hyperphagia). As a result, most experience rapid weight gain leading to obesity. People with Prader-Willi syndrome typically have mental retardation or learning disabilities and behavioral problems. Many people with this disorder also have distinctive facial features and short stature. The genitals in both males and females are underdeveloped, and most affected individuals are unable to conceive children (infertile). Additionally, some people with Prader-Willi syndrome have unusually fair skin and light-colored hair.



Next: How common is Prader-Willi syndrome? »

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Prader-Willi Syndrome

What are learning disabilities?

Learning disability is a general term that describes specific kinds of learning problems. A learning disability can cause a person to have trouble learning and using certain skills. The skills most often affected are:

  • reading,
  • writing,
  • listening,
  • speaking,
  • reasoning, and
  • doing math.

Learning disabilities (LD) vary from person to person. One person with learning disabilities may not have the same kind of learning problems as another person with learning disabilities. One person may have trouble with reading and writing. Another person with learning disabilities may have problems with understanding math. Still another person may have trouble in each of these areas, as well as with understanding what people are saying.

Researchers think that learning disabilities are caused by differences in how a person's brain works and how...

Read the Learning Disabilities article »










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