Colon polyps are fleshy growths on the inside (the lining) of the colon (the large intestine). Colon polyps are extremely common. Their incidence increases as individuals get older. Half of all people over the age of 60 harbor at least one polyp. Polyps give rise to colon cancer, the second leading cause of death from cancer in the US. Screening for colon polyps and removing them before they become cancerous markedly reduces the incidence of colon cancer. Colon polyps are more properly referred to as colorectal polyps since they occur in the rectum, too. Colorectal polyps are conventionally divided into two groups – non-neoplastic polyps and neoplastic polyps (also called adenomatous polyps or adenomas). The non-neoplastic polyps have not been considered precursors of cancer while the neoplastic polyps are precursors of colorectal cancer.