Colorectal cancer develops with few, if any, symptoms at first.
It depends a little on the location of the colon cancer. If the cancer is closer to the anus (left side), symptoms may include blood in or on the stool, a change in bowel habits, stools that are narrower than usual and general weakness and weight loss. These symptoms are more typical for colon cancer and physicians would easily recommend a colonoscopy for further work up. However if the tumor is on the right side, almost a foot away from the anus, the symptoms may be more general such as unexplained stomach discomfort, frequent gas, pains, or indigestion, unexplained weight loss and chronic fatigue.