The following sites may be useful for you to learn more about colon cancer.
Some of these sites, especially in the "suitable for participants" section have excellent information and advice about all aspects of bowel cancer.
Many of them are national charities working to raise awareness of symptoms, promote early diagnosis and encourage early access to treatment choice for those affected by bowel cancer. Take a few minutes to browse their sites and learn about bowel cancer and their work.
A word of warning - just because its printed on the web does not neccessarily mean its accurate or up to date.