Prader-Willi Syndrome is a genetic disorder that causes low muscle tone, short stature, incomplete sexual development, cognitive disabilities, problem behaviors, and a chronic feeling of hunger that can lead to excessive eating and life-threatening obesity.
In 1956, when the medical world first learned about Prader-Willi syndrome, doctors had no idea what caused people to have this collection of features and problems that we now know as PWS. It is only in the last 20 years that researchers have discovered the genetic changes that are responsible for the syndrome.
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