After the surgical treatment of rectal cancer, corresponding complications may occur. The complications are as follows: 1. Bleeding: including abdominal bleeding and anastomotic bleeding, which usually occurs within 48 hours after surgery, and the anastomotic bleeding usually discharges bloody fluid through the anus; 2. Anastomotic fistula: in fact, anastomotic fistula is a complication that both doctors and patients are worried about, which usually occurs on the 5th-7th day after surgery. Anastomotic fistula can easily cause infection in the abdominal cavity and even peritonitis and infectious shock; 3. Infection: including lung infection and abdominal cavity infection; 4. Prerectal resection syndrome usually occurs after rectal cancer surgery, which generally refers to the phenomenon that after rectal cancer resection, patients often experience fecal incontinence, increased number of bowel movements, intention to defecate but no defecation; 5. Pelvic vegetative nerve injury: caused by difficulty in urination and sexual function changes; 6. Intestinal obstruction caused by intestinal adhesions, postoperative patients may experience recurrent abdominal distension, abdominal pain, and inability to defecate and vent from the anus. When postoperative complications occur, it is important to go to the hospital in time.