Breast overflow is a pathology that is often difficult to heal on its own. Breast bleeding is often indicative of ductal damage or lesions in the breast. The most common cause of breast overflow is intraductal papilloma, which has the potential for malignant transformation, and should be treated with surgery to remove the diseased ducts and surrounding breast tissue as soon as possible. Intraductal papillary carcinoma is often a benign tumor, with a malignant rate of 6~8%. After surgery, it is necessary to improve pathological examination to clarify the nature of the tumor before deciding whether subsequent treatment is needed. In addition, other causes of breast overflow include inflammatory breast disease (acute mastitis), breast cancer, breast trauma, etc., which need to be carefully identified. Once breast overflow occurs, you should seek medical treatment immediately to make a clear diagnosis and standardize the treatment so as to avoid delaying the condition.