Prader-Willi Syndrome is a rare genetic disorder and results from mutation in genes, which are present on chromosome 15. The mutations are spontaneous and in rare cases they are inherited.

The symptoms of the disease include poor muscle tone and a constant craving for food. Patients suffering from the disease also have decreased levels of sex hormones.

The people suffering from this disease have a small mouth and their eyes are almond shaped. The other characteristics of the disease include short stature, slow learning in puberty. The children suffering from the disease may also show behavioral problems.

The disease is caused due to the improper functioning of hypothalamus. It is the part of the brain, which controls the hunger sensations.

Due to the defects in the hypothalamus, people always crave for food and the same results in obesity.

The disease was discovered by two physicians in the year 1956 and hence is named after them.

It is also known as floppy baby syndrome. The reason behind it is that the babies born with this disease have a poor muscle tone or it is totally absent.

In this disease, after the age of one year, the baby has an increased craving for food, which results in obesity.

There is no cure for the disease however, early detection proves beneficial and the administering the Human Growth Hormone to the children is beneficial in dealing with obesity.