What causes Gigantism?

Gigantism is caused by overproduction of the Growth Hormone that occurs during childhood. The overproduction of the growth hormone is due to a Pituitary Gland tumor. As the tumor grows it compresses against the Pituitary Gland making an excessive amount of GH. Other less common causes of Gigantism are:

McCune-Albright Syndrome: A disease that causes abnormal bone tissue growth.

Multiple Endocrine Neoplasia Type 1: A disorder that is inherited and causes tumors to grow in the Pituitary Gland, Pancreas, and Parathyroid Glands.