After breast reduction surgery, there may be sequelae such as bilateral breast size difference, infection, hematoma or nipple and areola damage. It is recommended that patients choose regular hospitals for the surgery, and the risks and precautions of the surgery need to be clarified before the surgery. 1. Different size of bilateral breasts: Breast reduction surgery is mainly based on liposuction and pure surgery, during the operation, if the doctor adjusts the size of breasts improperly, it can lead to different size of breasts on both sides. 2. Infection: poor concept of asepsis during the operation or poor care of the incision place after the operation can lead to bacterial, fungal, viral and other pathogens infection. 3. Hematoma: When too many glands are removed during breast reduction surgery, the scope is too large, or the hemostasis is not complete, it can lead to hematoma of the chest after surgery. 4. Nipple and areola damage: improper operation during breast reduction surgery can lead to nipple sensory impairment, and in serious cases, it can lead to nipple and areola necrosis. Patients who need breast reduction surgery are recommended to have it done in a regular and experienced hospital. Before the operation, you need to clarify with your doctor about the risks of the operation and the precautions to be taken before the operation.