If you haven’t had a child and often suck on your nipples, you generally won’t have milk. After pregnancy, the placenta will secrete a lot of estrogen and progesterone, estrogen will stimulate the development of the mammary gland ducts of pregnant women, so that the ducts are thickened, progesterone will stimulate the development of mammary gland follicles, the changes in the female breasts for the delivery of breast milk to get ready for the birth of a child, and the breasts of women who have never had a child do not have such changes, even if the child is often sucked nipple generally will not be able to have milk. If there is no pregnancy and delivery, breast lactation, may be the body’s prolactin is too high. Patients need to go to the regular hospital in time for examination to find out the cause, which may be caused by endocrine abnormalities in the body, pituitary tumors and other diseases, and then targeted treatment after checking out the cause.