Bleeding is almost never a problem with a colonoscopy. Although colonoscopy is a type of endoscopy, its technology is well established. Whether it is an ordinary colonoscopy or a painless colonoscopy, it is a very basic operation for specialists. During the colonoscopy, the patient’s bowel is prepared and cleaned, and then a tube is inserted through the anus to enter the scope, one side is inflated and the other side is inserted through the lumen to reach the ileocecal region, and then the scope is slowly pumped back to observe and collect pictures. If the examinee exists the situation of bleeding, consider that may be the doctor in doing the examination found that there are lesions in the intestinal tract, give the clamp to take the lesion tissue sent to the pathology biopsy, so there will be a biopsy wound, the wound is only a little blood seepage, can be coagulated by themselves, do not be nervous.