Early rectal cancer has a certain recurrence rate after surgical treatment. When the following four symptoms of postoperative recurrence of rectal cancer appear, we must pay attention to them. Pain is the most common initial symptom of postoperative recurrence of rectal cancer. Patients often have pain in the perineum and sacral area and may radiate to the lower limbs when rectal cancer recurs. Recurrence symptom 2: masses Patients with postoperative recurrence of rectal cancer can find nodular masses under the skin of perineum with hard texture and pressure pain. Recurrence symptom 3: change of stool habit and blood in stool, etc. Anal finger diagnosis is the most common diagnostic scheme for postoperative recurrence of rectal cancer. Most patients with recurrence of rectal cancer after surgery can be accompanied by adverse clinical symptoms such as blood in stool or change in bowel habits. Recurrence symptom 4: urinary symptoms Patients with recurrence of rectal cancer after surgery will have corresponding symptoms of recurrence of rectal cancer in urinary system and vaginal bleeding water because malignant cancer cells invade ureter, bladder, vagina and other organs.