The pain of a general colonoscopy can be tolerated. During ordinary colonoscopy, patients may experience somatic discomfort and pain to some extent, such as pain and abdominal distension. The reason may be caused by the reflex spasm of intestinal stimulation during the examination, pulling of the intestinal tract and mesentery, and acute dilatation of the intestinal canal by inflation, thus causing the examinee to be psychologically tense and fearful. As a commonly used intestinal medical device, enteroscopy is widely used in the clinical diagnosis and treatment of lower gastrointestinal diseases such as early colorectal cancer, colorectal polyps and internal hemorrhoids. Enteroscopy can observe the changes of lesions with naked eyes, and if necessary, it can take biopsy samples for pathological examination, which is of great significance to the early diagnosis and treatment of diseases.