The harm of prolactin pituitary tumor mainly includes several aspects: 1, the symptoms due to hyperprolactinemia, for example, women will produce excessive or low menstruation, menstrual disorders, or even amenorrhea, and sometimes it will affect fertility. Male patients may suffer from decreased libido, impotence, infertility and so on. The main problem related to hyperprolactinemia is the problem of gonadal axis and endocrine axis, which will cause some symptoms. 2, the compression of pituitary tumor itself to the surrounding tissues, if it is compressed to the optic nerve or optic nerve cross, it may cause visual acuity decline, visual field defects, and even in severe cases, it may cause blindness. 3, the pituitary gland of the prolactinoma compression to the normal pituitary gland, it will make the secretion of other hormones decline, that is, the function of the adenopituitary gland is usually called the adenopituitary gland, which is usually referred to as the pituitary gland. This is what is usually called hypopituitarism.