Colonoscopy is divided into flexible tube endoscope and rigid tube endoscope. The pain of doing anoscope with rigid tube endoscope is not great, but it is a little uncomfortable and does not need special preparation. B-ultrasound endoscopy and proctoscopy, you need to do enema, or wash the patient's stool with kaiselu, you can do this examination. When doing proctoscopy and sigmoidoscopy, patients should choose a very comfortable position. If the doctor operates very gently, the patient will not feel uncomfortable. If the operation is rough, you may feel pain or abdominal pain. The most uncomfortable thing is to do colonoscopy. There are two kinds of colonoscopy. First, prepare a general colonoscopy for the intestine. Before that, you should take some medicine to clean your stool. Then the mirror is longer, about 8 or 90cm. To reach the ileocecal part or even the end of the small intestine, this process needs to enter the mirror, and then take different positions to inflate and expand the intestinal cavity. In this process, patients have a feeling of rising pain, which about 90% people can tolerate. However, with the development of medicine, there are now painless colonoscopy, which is more than ordinary colonoscopy, about 70%. Painless colonoscopy refers to that patients go to sleep after taking medicine and complete colonoscopy during sleep. So the results of these two tests are the same. The difference is that painless colonoscopy has no pain and can complete the examination.