The first thing to do is to determine the nature of the overflow and what color it is. If it is white, clear color, consider the dilatation of the milk ducts, inflammation in the milk ducts; milky color, consider the accumulation of breast milk; if yellowish green or bloody color, consider the formation of intraductal masses, such as intraductal papilloma, intraductal invasive carcinoma. If you want to make a clear diagnosis, you have to perform lactoductoscopy, which is a procedure to enter the overflowing milk ducts and determine whether there is a mass formation or inflammation under direct visualization. If inflammation is present, a medicated douche can be performed; if a mass is present, it is necessary to perform a mammogram to localize it, followed by surgical intervention. In either case, treatment should be aggressive.