It is a rare disorder resulting from increased levels of growth hormone before the fusion of the growth plate which usually occurs at some point soon after puberty. Gigantism is treatable, and treatments aim to manage pituitary tumor growth, control GH levels, and limit their effects on the body. This article describes what gigantism is, including its... Gigantism is abnormal growth due to an excess of growth hormone (GH) during childhood. We’ll explain the causes of gigantism , how to recognize the signs and symptoms of this condition, and treatment options — from surgery to medications.