Basophilic cells in the pituitary gland secrete thyrotropin, adrenocorticotropic hormone, and gonadotropin. Thyrotropin is responsible for regulating the function of thyroid cells. Excessive synthesis or secretion of thyrotropin may lead to hypothyroidism. Too little secretion may lead to hyperthyroidism. Adrenocorticotropic hormone promotes tissue proliferation in the adrenal cortex, as well as the production and secretion of sebum hormones. Excessive secretion of adrenocorticotropic hormone may be associated with primary adrenal insufficiency. Secreted gonadotropins can promote the production and secretion of sex hormones. Therefore, if abnormal pituitary function occurs, it will affect the secretion of various hormones, which may manifest clinically as Cushing’s syndrome and hypogonadism, the most common cause of which is pituitary tumor.