What are the symptoms for colon cancer? what are the causes colon cancer?

Rectal bleeding is c: Colon cancer can be entirely silent disease, producing little or no symptoms when early and localized to the bowel. So screening with colonoscopy in asymptomatic subjects is advised to look for polyps which are precursors of colon cancer. Rectal bleeding and abdominal pain can be symptoms of this cancer but they are often not early symptoms. The cause of colon cancer is not known.