Ductal dilatation with overflow may be a benign lesion, such as simple dilated milk ducts, and is not serious. If the ductal dilatation with overflow is caused by serious diseases, such as intraductal papilloma, cancer, etc., it will be more serious. 1. Benign lesions: If the ductal dilatation with overflow is caused by simple breast duct dilatation, it may belong to benign lesions, commonly seen in breast duct hyperplasia caused by breast hyperplasia, and a small amount of fluid may appear, usually without special treatment. 2. Serious diseases: If the ductal dilatation is caused by papilloma, cancer and other serious diseases, it will be more serious, and there may be bloody overflow, which should be treated by surgical excision as soon as possible. Therefore, it is recommended to go to the breast department of regular hospital as soon as possible for consultation and examination, such as ultrasound, endoscopy, etc., to clarify whether there is a mass in the milk ducts. If there is a mass in the milk ducts, further examination is needed to clarify the nature of the mass and to exclude the possibility of papilloma or cancer in the milk ducts as early as possible.