The amount of bleeding in breast augmentation depends on the operation method: 1. Breast augmentation by injecting autologous fat particles: autologous subcutaneous fat is sucked out by liposuction to remove fibrous tissue and bloody liquid, and the extracted fat particle cells are injected into the deep surface of the breast through a syringe. Therefore, there is no bleeding in the process of fat injection, and the only bleeding is a small amount of blood sucked out together with the injected swelling liquid when fat is extracted. Generally, this liposuction method contains about 20ml of blood in 1000ml, and the amount of fat required for each injection is about 60 ml ~1000 ml. It can be seen that the amount of bleeding in breast augmentation surgery with autologous fat injection is very small. 2. Free transplantation of autologous fat fascial flap with vascular anastomosis: This operation was first reported by Dr. Qiao Qun from Plastic Surgery Hospital of China Academy of Medical Sciences. It's a microsurgery, and there may be a little bleeding when cutting the valve, but careful operation has reduced the amount of bleeding to a minimum. The amount of bleeding is about 100 ml ~ 150 ml, which means it is less than blood donated for free, and it recovers quickly after operation. In addition, a small amount of bleeding and hemodilution are beneficial to the good recanalization of anastomotic vessels after operation. 3. Prosthesis implantation for breast augmentation: No matter whether the prosthesis is implanted under the gland or under the pectoral muscle, these two parts are anatomical physiological gaps, and there are only some microvessels between them. Therefore, no matter what incision is used, it is easy to separate at this level, and there is no damage to large blood vessels, and it will not cause a lot of bleeding. Except for a small amount of exudation, the total amount of bleeding is about 30 ml ~ 50 ml. It can be seen that no matter what method or incision is used for breast augmentation, there is no need to consider the bleeding problem, let alone whether blood transfusion is needed or whether infectious diseases related to blood transfusion are infected. However, it is worth noting that no matter which surgical method is used for breast augmentation, necessary medical history and laboratory examination are needed. If you have hemophilia, thrombocytopenia, liver disease and other hemorrhagic diseases, you may have massive bleeding during the operation. Blood routine and coagulation mechanism should be detected before operation. In addition, it is worth noting that women are not suitable for surgery during menstruation. During menstruation, the coagulation mechanism is poor and the amount of bleeding is relatively large.