Many young couples are suffering from infertility, and many of them will first think of going to gynecology or men’s clinic, however, do you know that? In fact, pituitary tumor is also a major cause of infertility, so why does pituitary tumor cause infertility? Pituitary tumors are benign tumors located in the pituitary gland. The pituitary gland is the most important endocrine gland in the human body, controlling the secretion of many important hormones such as growth hormone, thyroid stimulating hormone, gonadotropins, oxytocin, prolactin, etc. It is also capable of storing antidiuretic hormone secreted by the hypothalamus. If there is a problem with the pituitary gland, then it will have a direct impact on the endocrine system, in which prolactin cell adenoma will make the patient amenorrhea, breast milk overflow, infertility, heavy armpit hair loss, pale and delicate skin, increased subcutaneous fat, as well as fatigue, fatigue, drowsiness, headache, hypogonadism and so on. In men, it can be manifested as loss of libido, impotence, breast enlargement, scanty beard, atrophy of the reproductive organs in severe cases, reduction of sperm count, infertility, etc., which will lead to infertility.