Pain is the most common initial symptom of postoperative recurrence of rectal cancer. Patients with postoperative recurrence of rectal cancer often have pain in the perineal region, sacral region and radiating to the lower limbs. 2.Lumps Patients with postoperative recurrence of rectal cancer may have subcutaneous nodular masses in the perineum, which are hard in texture and may cause pressure pain. 3.Change of stool habit and blood in stool etc. Anal diagnosis is a common diagnostic method for postoperative recurrence of rectal cancer. Patients with recurrence of rectal cancer after surgery are often accompanied by blood in stool or changes in bowel habits, etc. 4.Urological symptoms Patients with recurrence of rectal cancer after surgery may have corresponding symptoms of recurrence of rectal cancer in the urinary system due to the invasion of ureter and bladder by cancer cells.