Growth hormone is secreted by pituitary cells in the human brain, and its secretion is pulsatile, with growth hormone levels rising significantly after sleep and falling when the patient is awake. The secretion of growth hormone is mainly regulated by the growth hormone-releasing hormone in the hypothalamus. When the pituitary cells become diseased, such as the formation of tumors, it will lead to excessive secretion of growth hormone and lead to gigantism or acromegaly, and if the pituitary cells are damaged and the secretion of growth hormone is reduced, dwarfism will occur.