The direct cause of hair growth on the nipples is mainly due to the elevated level or excessive action of androgens in the body, mainly: 1, because of diseases such as endometriosis or uterine fibroids, patients may use androgens to treat the primary disease, resulting in high levels of exogenous androgens, which can easily make patients grow hair on the nipples. 2, suffering from polycystic ovary syndrome, ovarian secretion of sex hormone dysfunction, resulting in the body’s 3. Although the androgen level in the body is not very high, the hair follicle tissue in the nipple area is more sensitive to the action of androgens, causing long hair on the nipple. 4. Dietary factors, individuals who often like to eat all kinds of fried and deep-fried food, like to eat burgers, fried chicken legs and other foods, are prone to endocrine disorders and long hair on the nipple area.