see a doctor - colon cancer is one of the worst deaths... here's a google:

What is the death rate of colon cancer?

If the cancer is diagnosed at a localized stage, the survival rate is 91%. If the cancer has spread to surrounding tissues or organs and/or the regional lymph nodes, the 5-year survival rate is 72%. If colon cancer has spread to distant parts of the body, the 5-year survival rate is 14%.