If you’re 45 or older, it’s time. Most colon cancers begin as noncancerous growths of tissue (polyps) in the lining of the colon. Over time, these polyps can grow and become cancerous. Finding them early eliminates the chance that they will become cancerous. For some, screening should begin earlier. This site gives you the facts straight from our expert gastroenterologists and a personal experience story from one of our patients. If you are experiencing symptoms or have other risk factors, talk to your doctor about when screening should start for you.