Women won’t be able to squeeze out milk for half a month after weaning, and it’s an abnormal performance to be able to squeeze out milk for half a year after weaning, which is medically known as nipple overflow, and most of it is caused by endocrine disorders, taking contraceptive pills, mammary duct dilatation, and mammary malignant tumor, and so on. After childbirth, due to poor recovery of ovarian function, it will cause endocrine disorders, which will lead to nipple overflow, and most of the contraceptive pills are compound preparations containing estrogen and progesterone, which will act on the breasts after a long period of time, thus leading to nipple overflow. Dilatation of mammary ducts is a relatively common gynecological breast disease, which may present with symptoms such as breast swelling and pain and nipple discharge. Breast malignant tumors that invade the breast tissue and ducts can also cause nipple discharge, which is mostly bloody. Women with nipple discharge should pay enough attention to timely examination and treatment to avoid delaying the condition.