Postoperative anal pain after rectal cancer surgery may be caused by the failure of anesthesia, or it may be caused by low surgical site or postoperative complication of infection. Postoperative anal pain after rectal cancer surgery also needs to be alert to whether tumor recurrence or metastasis. Rectal cancer is a kind of malignant tumor disease originated from rectal mucosa epithelium. If patients have anal pain after rectal cancer surgery, it may be that the anesthesia drug used in the surgery is metabolized by the body, so there will be slight pain in the surgical site, which is mostly considered to be a normal postoperative manifestation. Secondly, it may also be due to a poor anastomosis caused by the presence of edema in the rectum due to a low surgical position. When irritated by intestinal contents, anal pain is easily caused. Besides, if the surgical site is infected by bacteria, anal pain after rectal cancer surgery will also occur. Usually, after rectal cancer surgery, you need to pay more attention to rest, adjust the diet structure and keep the bowel movement smooth. Postoperative anal pain after rectal cancer surgery may also be caused by tumor recurrence, which needs further examination. To sum up, there are many reasons leading to postoperative anal pain after rectal cancer surgery, patients want to go to hospital for further relevant examination and cooperate with doctors for active treatment.