A colonoscopy is a procedure in which a gastroenterologist is able to view the entire length of your colon through a camera on the end of a thin screening tool. You will be given medicine to make the procedure comfortable and most patients tolerate it very well.
Most importantly, a screening colonoscopy can save your life. If found early, colorectal cancer is over 90% curable. The procedure is covered by most insurance policies with no out of pocket expense to you.
Most people have heard horror stories of the "prep" day and refuse to have the procedure. You should know that the available preps have come a long way and a typical response is, "It wasn't as bad as I was expecting."
Don't let fear determine your quality of life. For more information, see below.