The number of years a colonoscopy can be covered for cannot be generalized and is related to the specific health condition of the person being examined. Colonoscopy is an examination used to detect changes or abnormalities in the tissues of the lower gastrointestinal tract, such as the large intestine, rectum and anus. For people who have a health checkup, if no obvious abnormality is found in the first checkup and there are no uncomfortable symptoms, it is usually possible to review the test at an interval of about 1-3 years. However, if the first examination reveals diseases of the intestinal system, such as ulcerative colitis, intestinal polyposis, colorectal cell carcinoma, etc., it is necessary to make a comprehensive judgment by combining the actual type of disease, treatment effect and other factors, and it is recommended to conduct regular review under the guidance of a doctor to better understand the changes in the condition and the effect of treatment, and the interval of its review usually varies from 3 to 12 months. After undergoing colonoscopy, the patient should observe his/her physical condition. If there are adverse symptoms such as persistent bloody stools, abdominal pain, fever, etc., the patient should have a follow-up examination and treatment in a timely manner.