Before the colonoscopy, many intestinal diseases can only be seen in the fog by anaesthesia, just as the ancients used a bronze mirror to look at themselves; with the colonoscopy, we found that the intestine can also be seen so clearly. In recent years, the incidence of colitis, intestinal polyps, rectal cancer and other intestinal diseases show a rising trend year by year, so many scholars advocate that the first colonoscopy should be done after the age of 40. The following is to introduce the knowledge of colonoscopy: clinical significance of colonoscopy Applicable diseases: colorectal polyps; ulcerative colitis; chronic colitis; colon cancer, etc. It can also be used for polypectomy, intestinal hemostasis, etc. Indications for colonoscopy 1. long-term perianal drop; 2. long-term diarrhea, abdominal pain, constipation treatment is ineffective; 3. abnormal stool, the body has recently lost weight sharply; 4. with mucus, pus and blood; 5. any reason abnormal body wasting. Examination precautions The cleanliness of the intestinal tract is one of the key factors in the success or failure of colonoscopy. If there is still a lot of feces in the intestine at the time of examination, it will affect the access and observation, and even the whole colon examination cannot be completed. Therefore, it is important to prepare the intestinal tract for cleansing before the examination. Oral laxatives are one of the most commonly used, reliable and safe methods in clinical practice. The recommendations are as follows: eat a semi-liquid diet with little residue, such as thin rice, and no vegetables or fruits with seeds, such as watermelon, the day before the examination. About 4 hours before the examination, during the period of oral cathartics appropriate activities, diarrhea until the excretion of clear water. If there is no bowel movement after 4 hours after the end of drinking, it is ineffective, i.e., a cleansing enema should be performed. Colonoscopy is the easiest, safest and most effective method to detect intestinal tumors and precancerous lesions. For the sake of intestinal health, give your intestines a look in the mirror!