Gigantism is abnormal growth due to excessive growth hormone as a child, and is normally caused by an adenoma or tumor on the pituitary gland. The tumor cells are where the production of the excessive hormone takes place.
The presence of the tumor may be a result of a genetic mutation passed down from generation to generation. The disorder has a number of symptoms, some of which are very obvious like enlarged hands and feet. Other symptoms may not be as noticeable or directly connect with the condition like carpel tunnel syndrome and headaches. Treatment for the condition can involve surgery, or depending on the severity of the tumor, medication may be enough to help control the condition, according to UCLA Health.