Breast overflow is commonly associated with the following diseases: i. Intraductal papilloma. The main manifestation of intraductal papilloma is nipple discharge, which is often seen for contamination of underwear. Breast cancer. Commonly seen as intraductal papillary carcinoma or ductal carcinoma, which can be seen as bloody nipple overflow. Mostly seen in middle-aged women, the overflow is mostly plasma-colored or yellow-green, mostly bilateral nipple porous ductal overflow, and often presents periodic breast pain clinically. IV. Dilated milk ducts. The color of the overflow is mostly pale yellow overflow, occasionally bloody fluid. V. Ductitis of the breast. The overflow is often cloudy and purulent.