Weaning three years of non-nursing period can still squeeze out milk is considered to be abnormal breast secretion, also known as nipple discharge, mainly associated with breast disease, infectious diseases, endocrine diseases, etc.. 1. Breast diseases: such as breast cystic hyperplasia patients nipple can appear plasma overflow, breast cancer patients can appear bloody overflow, milk ducts within the papilloma can appear dark brown or yellow, bloody overflow. 2. Infectious diseases: such as plasma cell mastitis, acute suppurative mastitis and other diseases can appear local redness, swelling, heat and pain, while the nipple can be accompanied by bloody or purulent overflow. 3. Endocrine diseases: such as prolactinoma, idiopathic hyperprolactinemia and other diseases can cause the pituitary gland to secrete abnormally high levels of prolactin, leading to headaches, lactation and other symptoms. Weaning three years of non-lactating period can still squeeze milk also consider whether there is another pregnancy, it is recommended that the patient timely consultation, improve the hormone 6, breast ultrasound and other examinations, to identify the causes of abnormal nipple secretion after active treatment, in order to avoid delaying the condition.