For decades, colon cancer has been known as both the cancer no one talks about and as a
silent killer.
No one talks about colon cancer because it is a distinctly unpleasant topic that's related a
part of human anatomy and a bodily function that most people find unpleasant to discuss: the bowels.
It is a silent killer because symptoms don't appear until the disease has advanced to a very
dangerous, even terminal stage.
After covering some of the basics of the digestive system , the narrator in the video
below explains how colon cancer starts and then lists the symptoms that are likely to start
appearing.