Gastroenteroscopes are now thinner and called fiber colonoscopes or fiber gastroscopes. The operation of the degree of proficiency is also more and more skillful, generally speaking is not particularly painful, need to do some preparatory work. Nowadays, the electronic gastroscope itself is also a thin tube, the image is also very clear, together with some background music, in advance to use some antiemetic and antispasmodic, as well as local anesthesia drugs, gastroscopy is not very uncomfortable. In addition, in addition to the routine examination, there are painless gastroscopy or painless colonoscopy need to be in the anesthesia under the cooperation, the patient does not feel obvious discomfort, before and after doing may have some slight feeling, but generally acceptable.