How often a colonoscopy is performed requires a comprehensive judgment in conjunction with the patient’s health status. Colonoscopy is a common examination method in anorectology, which allows doctors to visualize the internal conditions of the patient’s colon, rectum and other lower gastrointestinal tissues, and if necessary, direct pathological biopsy can be performed to clarify the patient’s specific condition. Generally, for patients with intestinal diseases, such as rectal prolapse, intestinal polyposis, colorectal cancer, etc., the interval between colonoscopies varies from 3-12 months, and it is recommended to follow medical advice for better observation of disease changes and treatment evaluation. For healthy checkups, they can be performed every 1-2 years to exclude possible intestinal pathologies and to achieve disease prevention. It is important to avoid high-fiber foods before the intestinal examination in order to achieve a better degree of intestinal cleanliness and to facilitate the smooth conduct of the examination program.