Large intestine and rectum constitute colon. Primary function of colon is the removal of water from undigested material and convert it in to waste material that passes through rectum and finally out of the body through the
anus. Cancer affecting colon is termed as colon cancer. Risk factors that increase the incidence of disease are age above 50 years, smoking, diseases that cause increased inflammation of colon, colorectal polyps, history of
colorectal cancer family and genetic alterations. Diet poor in fiber results in formation of waste material that is hard to pass through rectum. Hence, a diet that is poor in fiber, calcium and folate for very long period results in colorectal cancer