Prader-Willi Syndrome Causes, Signs, Symptoms, Diagnosis, and Treatment Information on MedicineNet.com

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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.

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