Colonoscopy is a diagnostic method used by doctors to examine the internal lesions of the large intestine and colon. It is an invasive test, and some colonoscopies may cause abrasions to the intestinal mucosa and minor damage to the intestinal tract. Colonoscopy mainly refers to electronic colonoscopy, colonoscope through the anus into the intestinal lumen, allowing doctors and examiners to directly observe the internal condition of the patient’s large intestine and diagnose intestinal diseases. When performing colonoscopy, the body of the colonoscope will rub against the intestinal mucosa, which may cause damage to the intestines, with mucosal congestion and edema, and if the friction is more serious, it may also complicate inflammation, and even cause intestinal perforation and intestinal bleeding. However, usually the gastrointestinal mucosal damage caused by colonoscopy is relatively mild, and will soon repair itself, for more serious intestinal mucosal damage, can be under the guidance of a professional doctor oral gastrointestinal mucosal protection agents, such as omeprazole, colloidal bismuth pectin, aluminum thioglycollate suspension solution. It is recommended that patients choose to go to a regular hospital for colonoscopy, pay attention to daily diet after the examination, avoid eating greasy, spicy, stimulating food, such as fried food, chili peppers, etc., so as not to stimulate the gastrointestinal mucosa and aggravate the degree of damage.