The nipples squeeze out yellow water in several cases, the specific analysis is as follows: 1, mastitis. Twisted milk ducts or nipple deformity, resulting in the secretion of milk stagnation in the breast, if the nipple is cracked at this time, bacteria will enter the breast from the nipple causing mastitis. If the nipple is cracked, bacteria will enter the breast from the nipple and cause mastitis. Anti-infection treatment is needed, and if left untreated for a long time, pus will form and yellow liquid will flow from the nipple. Patients will have hard breast lumps with indistinct edges and hard texture, and adhesions with surrounding tissues. There will also be nipple retraction and swelling, with fluid exudation, which can be yellow or bloody. In the early stage, patients need to go to the hospital for surgery to remove the tumor. 3. Patients may have yellow water from the nipple. It is feasible to perform mammography, mammoscopy, mammography and other examinations to clarify whether there are lesions in the milk ducts and decide whether surgery is needed.