Bleeding water from the breasts is generally an abnormal phenomenon and should be treated promptly to identify the cause. The most common causes of breast bleeding include incomplete recovery from surgery, trauma and disease. 1. Incomplete recovery of surgical wounds: Incomplete recovery of surgical wounds is often manifested as bleeding or hematoma after surgery. If the wound does not heal well after surgery or if the wound is not treated properly, it may cause localized bleeding of the breast, so it is necessary to treat the wound under the guidance of the doctor to avoid infection or complications after bleeding. 2. Trauma: Breast bleeding caused by trauma is mostly due to localized damage to the breast caused by impact or excessive squeezing. If the bleeding is mild, the breast can recover on its own, and you can stop the bleeding at home, but if the bleeding is more serious, you need to go to the hospital in time for treatment. 3. Disease: Nipple bleeding is mostly caused by intraductal papilloma of the breast, which will lead to the rupture of capillaries in the breast in the process of growth, and the blood will be discharged along the nipple, which is often shown as red or black. Common diseases include mastitis, breast cancer, breast hyperplasia function, etc. Patients need to go to the hospital for professional treatment. It is recommended that if breast bleeding occurs, if it is a bruise and the bleeding is mild, you can stop the bleeding at home, but if the bleeding is large and the cause is unknown, the patient needs to go to the hospital in time to avoid delaying the condition.