Three months after surgery for rectal cancer, routine blood tests, blood biochemistry tests, chest X-ray and ultrasound of the abdomen and pelvis are repeated. If a prophylactic ileostomy was done, a colonoscopy is also required. Rectal cancer refers to cancer between the rectosigmoid junction and the dentate line, and is one of the most common malignant tumors of the digestive tract. After surgical treatment, patients usually have to go to the hospital for review after three months to do routine checkups such as blood routine, blood biochemistry test, etc. They also have to do chest X-ray, ultrasound of abdomen and pelvis, etc. to check the condition of both lungs as well as the abdominopelvic organs. If the patient also has a prophylactic ileostomy, then 3 months after the operation, it is basically time to return the rectum, and at this time, in addition to the above review items, it is also necessary to do a colonoscopy to find out the healing status of the rectal anastomosis. Surgery plays a central role in the treatment of rectal cancer. After surgery, patients should insist on respiratory exercises such as independent coughing, sputum expulsion and deep breathing to prevent pulmonary atelectasis and lung infection, and should get out of bed at an early stage to reduce intestinal adhesion and prevent thrombosis, which is conducive to postoperative recovery. It is recommended that patients should pay attention to the postoperative rehabilitation training after surgery, and consciously go to the hospital for review after three months.