About rectal cancer surgery, I am sure most patients are aware of it. Rectal cancer resection is the first choice of treatment for early stage rectal cancer. However, surgery has both advantages and disadvantages. Although it can remove cancer lesions, it cannot completely remove cancer cells in patients’ body, and the residual cells will continue to grow, increase in value, differentiate, spread and metastasize in patients’ body and deteriorate to a certain extent. 1. Change of stool habit and blood in stool, etc. Anal diagnosis is a common diagnostic method for recurrence of rectal cancer after surgery. Patients with recurrence of rectal cancer after surgery may have blood in stool or change in bowel habits, etc. 2.Urological symptoms Patients with post-operative recurrence of rectal cancer may have corresponding urological symptoms due to the invasion of ureter and bladder by cancer cells. Pain is the most common initial symptom of postoperative recurrence of rectal cancer. Patients often have perineal drop, sacral pain and radiating to lower limbs when postoperative recurrence of rectal cancer occurs. 4.Lumps Patients with postoperative recurrence of rectal cancer can find nodular lumps under the skin of perineum, which are hard in texture and can appear as pressure pain.