Do you ever consider how many medical procedures we have on in a life-time that may not be necessary? Having had an uncle with colon cancer and having had a colonoscopy myself, I can certainly stress the importance of this procedure to detect cancer or precancerous growths. According to this article, you may need only one colonoscopy in a life-time. There are other forms of screenings for such problems other than a yearly colonoscopy. For example, getting a yearly stool sample (checking for blood). These other options are much cheaper and are less time consuming. Check out this article for more information.