Generally speaking, for breast cancer surgery, local anesthesia is first used to biopsy the pathology. After removing the pathology, it is quickly determined whether it is malignant or benign. Then, the procedure is switched to general anesthesia to perform either modified radical mastectomy or radical mastectomy, or a sentinel lymph node biopsy. The approximate time is about two hours, plus postoperative care, it usually ends in about two and a half hours, and then the patient is sent back to the ward to rest, generally not exceeding three hours.