If perforation occurs after colonoscopy, it is usually detected within a few minutes or tens of minutes, and patients mainly present with severe abdominal pain, pressure pain or rebound pain, which needs to be treated promptly. Colonoscopy is to put a colonoscope into the intestine through the anus to observe the lesions in the intestine, which is generally safe and rarely results in intestinal perforation. For patients with combined colon tumors, severe ulcerative colitis, Crohn’s disease, intestinal tuberculosis and other diseases, gas during colonoscopy may cause intestinal perforation. If intestinal perforation occurs, the patient will experience severe abdominal pain, pressure or rebound pain, which is usually detected within minutes or tens of minutes. In addition, a small number of patients may experience increased abdominal pain and blood in the stool the day after colonoscopy, and perforation may be detected by performing abdominal plain film or ultrasound.