The main reason why one should never have surgery in the late stage of cancer is that in the late stage of cancer, most of the cancer cells have metastasized extensively, so the best time for surgery is lost and doing surgery cannot bring good results for the prognosis of patients. At the same time, surgery in the late stage of cancer, due to the poor physical condition of patients, anemia and hypoproteinemia, poor tolerance of surgery, therefore cannot withstand the trauma of surgery and anesthesia, more risks during, after and perioperative surgery, more complications, and poor prognosis. Postoperative infections are easily complicated by multi-system infections, such as infections of the respiratory system, urinary system, and soft tissues of the skin, and incisions heal more slowly, and the prognosis of patients does not improve very well. The serious consequence is to cause the patient to die within a short period of time. Therefore, surgery is generally not recommended to be given in the late stage of cancer if there are no acute symptoms, such as obstruction, perforation and bleeding of the digestive tract.