Besides, does it hurt to do surgery under local anesthesia? Jun Guo, Department of Plastic Surgery, Yangzhou First People's Hospital: Normal tracheal intubation anesthesia, the trachea was blocked by the intubation tube, and foreign bodies could not enter the trachea. Informal intravenous anesthesia, such as small breast anesthesia, no intubation during operation, falling back of tongue root during operation and secretion blocking respiratory tract are the main causes of asphyxia during operation. In local anesthesia surgery, theoretically, patients can cough up secretions, but if the amount of bleeding during surgery is large, patients often have no time to cough up, and choking is also common. More importantly, under local anesthesia, muscle relaxants (which can cause suffocation) are prohibited, so the patient's muscles cannot relax. Pulling the wound without relaxing muscles will cause acute muscle strain, and postoperative muscle soreness is inevitable. Moreover, under local anesthesia, the exposure of surgical field of vision, the patient's active cooperation can not reach the best state, doctors are eager to end the operation, it is difficult to have enough time to re-examine the wound, thus affecting the accuracy of the operation. Noise generated by operation of surgical instruments during operation. For patients, it is also a lifelong malignant stimulus, and many people suffer from lifelong mental illness. Therefore, local anesthesia is not an ideal anesthesia method for mandibular angle resection. General anesthesia is the safest.