There are many causes of enlarged nipples in women, usually caused by physiological and pathological reasons. It is recommended to consult a doctor for diagnosis and treatment under the doctor’s guidance. 1. Physiological factors: due to the abnormal secretion of estrogen and progesterone in the body of women during menstruation, pregnancy and puberty, the phenomenon of re-growth of mammary ducts or follicles in the nipple will cause swelling and pain in the nipple, or when the breast is subjected to external stimulation, the nipple enlargement symptom will also occur. 2. Pathological factors: such as breast hyperplasia, breast inflammation, tumor, etc., it is recommended to observe whether there is pain in the nipple, whether there is liquid outflow, some of the women’s breasts at the beginning of the onset of the disease is no obvious symptoms, such as pain and liquid outflow, it is recommended to consult a doctor in time to carry out a pathology examination, drug treatment and surgical treatment. If a woman has an enlarged nipple, it is recommended that she go to the hospital in time for standardized examination and treatment.