The sequelae of rectal cancer anal preservation surgery, strictly speaking, cannot be called sequelae, from the expression called postoperative complications may be relatively more appropriate. If postoperative anal swelling or frequent bowel movements occur, this may be related to patients with ultra-low anus preservation, where the anastomosis is closer to the anus and postoperative anal irritation symptoms occur, and patients will want to defecate frequently, which will be relieved in 1-6 months after surgery in most patients. The second common complication is anal stricture, i.e., postoperative dyspareunia symptoms, which is a scarring stricture of the anal anastomosis, thus leading to postoperative defecation dysfunction in patients.