18-year-old nipple secretion of white material is not normal can not be generalized, need to be analyzed on a case-by-case basis, which can be seen in physiological conditions, can also be seen in pathological conditions, such as intraductal papilloma, breast cancer, pituitary gland lesions and other diseases, you should go to the hospital to find out the cause of the disease, and follow the doctor’s instructions for treatment. Physiological conditions, sex hormone secretion during puberty can also lead to white discharge from the nipple, at this time only need to pay attention to keep the breast and nipple area clean and hygienic. Pathological conditions, intraductal papilloma and breast cancer can be seen in addition to white discharge, but also touch the swelling, nipple depression, breast pain and other symptoms. Pituitary lesions are prone to increased secretion of sex hormones and white discharge from the nipple, as well as manifestations such as hyperthyroidism and Cushing’s syndrome. It is recommended that the patient go to the hospital, improve the examination, and make a clear diagnosis under the guidance of the doctor.