Describe what doctors believe causes gigantism, which hormone is mainly associated with this condition, and two health conditions that may result from having gigantism.

Gigantism is a condition that results to abnormal growth of human body, in terms of height, the girth and other body parts which grow larger than usual.
Doctors believe that the condition is caused by a tumor in the pituitary gland that results in its alteration which results in excess production of Growth hormone. Growth hormone is a hormone responsible for the body growth and development and its increased production is associated with gigantism. Having gigantism may cause various health conditions and disorders as well which includes insomnia, delayed puberty in girls and boys, deafness among other conditions