The pituitary gland secretes many hormones, such as gonadotropins, which promote the development of sexual organs and the secretion and synthesis of sex hormones, and play a very important role in growth and development. In addition to the secretion of gonadotropins, adrenocorticotropic hormones, which are also secreted by the pituitary gland, promote the proliferation of the adrenal cortex and have a role in the synthesis and secretion of adrenal hormones secreted by the adrenal glands. The pituitary gland also secretes thyrotropic hormone, which is secreted by the thyroid gland. Thyrotropic hormone is an upstream hormone, and upstream means that its command center is in the pituitary gland, so thyrotropic hormone is a hormone secreted by the pituitary gland that promotes thyroid cell proliferation and proliferation, and promotes thyroid gland synthesis and secretion of thyroid hormone. Both elevated and decreased thyroid hormones appear in pathological states, with hyperthyroidism occurring with an increase and hypothyroidism with a decrease. Therefore, the pituitary gland has a negative feedback mechanism with the downstream hormones to maintain normal metabolism in the body through interconnection.