Having a colonoscopy three times a year is generally not significantly harmful, but an interval of more than three months is recommended. Colonoscopy is a diagnosis of colorectal and rectal lesions, the first colonoscopy found intestinal lesions, after treatment, need to be performed again to determine the condition of the colonoscopy. Three colonoscopies a year will not cause significant harm to the human body, but it is recommended that the interval between each colonoscopy be more than three months. Colonoscopy is an invasive operation, and there is some risk during the operation, but the risk is small. After the colonoscopy is over, you should pay attention to observe whether there is any abnormality in the stool, and whether there is any abdominal pain and other uncomfortable symptoms. If discomfort occurs, it is recommended to inform the doctor in time to deal with it.