Pituitary tumors can be harmful, mainly due to the compression of surrounding tissues caused by the growth of pituitary tumors, which can lead to headaches and visual field disorders. When pressed in important locations, such as around hypothalamus and aqueduct, it can cause hypotension, thermoregulation disorders, water-electrolyte disorders, and in severe cases, changes in breathing and heartbeat, and in more serious cases, death. In addition, pituitary tumors can also manifest as symptoms of related endocrine hormone disorders, such as lactational pituitary tumors, which can manifest as hypogonadism, headache, drowsiness, infertility, and hair loss in men; in women, it can manifest as overflowing breast, infertility, and hypogonadism.