There are several cases of yellow water coming out of the nipple, which are analyzed as follows: 1. Mastitis. The nipple can be a very important part of a person’s life, and it is important that he or she has a good understanding of what is going on in his or her life, and what is going on in his or her life, and what is going on in his or her life. It is necessary to carry out anti-infection treatment, long time without treatment will form pus, nipple will have yellow liquid out, need to fight infection at the same time breast puncture or incision pus, and then a few days after the operation of high negative pressure drainage. 2, breast cancer. Patients will have hard lumps in the breast, the edge of the lumps is not clear, and the texture is hard, and there is adhesion with the surrounding tissues, and there will be nipple retraction, swelling, and there will be liquid exudation, and the exuded liquid can be yellow or bloody. Early detection of the need to actively go to the hospital for medical treatment, surgical resection, late only chemotherapy.