Lactogen, or prolactin, is intuitively understood as a hormone that is secreted in large amounts by a woman’s body during the breastfeeding phase after childbirth to promote the production of milk. However, it is not known that men also have a very small amount of lactogen, which is normally maintained in a reasonable range. However, the secretion of prolactin is affected when: hyperpituitary or hypothalamic disorders caused by pituitary tumors; renal insufficiency; hypothyroidism; and certain medications can cause an increase in men’s prolactin levels, resulting in “hyperprolactinemia”. So what are the effects of large amounts of prolactin secretion on men? 1, breast swelling, enlargement, lactation, so that the man is not very “face”, and at the same time make their performance in sexual life is not good (impotence). 2, lactogen has an inhibitory effect on the gonads (testes), which reduces sperm production and abnormal sperm function in men’s testes, and can therefore also cause male infertility. Warm tip: For men with hyperprolactinemia, targeted etiological treatment can be taken on the basis of a clear diagnosis.