A pituitary tumor in the brain is a very serious matter. Because pituitary tumor is mainly divided into two major hazards: 1. Occupational effect, because this tumor will keep growing, only the growth rate has certain distinction. In the process of growing up, it may compress the surrounding nerves and blood vessels, and even erode the bone, causing a series of serious symptoms, such as headache, dizziness, nausea, vomiting, and some people may suffer from loss of vision and visual field. 2, more serious ones may cause endocrine system disorders, which is also the main harm, such as lactogenic pituitary tumor, which may cause lactation in men and menstrual disorders in women. For example, pituitary tumors of the prolactin type may cause lactation in men and menstrual disorders in women, and may cause infertility in the long run. For growth hormone adenomas, they may cause thickening of the terminal phalanges, excessive secretion of growth hormone, and secretion of thyroid stimulating hormone and adrenocorticotropic hormone, which may cause a series of damage to body form and function.