Maybe none: First signs may be invisible rectal bleeding, changes to bowel function. Early colon cancers will have no symptoms. Colonoscopy is a way to find a colon cancer early.
Answered 12/10/2013
5.2k views
Colon cancer: Blood in the stool, whether or not you can see it, in addition to abdominal pain and bloating, constipation or diarrhoea which persists without explanation for more than a few days. Change in stool caliber is also sometimes noted.
Answered 5/7/2016
5.2k views
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