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A member asked:
Do all rectal/colon cancer have bloody or black stool?
A doctor has provided 1 answer
No. Microscopic poss: Not all colon cancers cause changes to stool that u can see w/ your eye. Some polyps (pre-cancerous lesions) cause MICROscopic blood in the stool that only sensitive lab tests can pick up. Bright red stool is thought 2 b from rectum, maroon red stool from intestine, & dark / black stool (melena) from stomach; however, it depends on how brisk bleeding is. Slow bleeds may not discolor stool at all.
Answered 9/10/2015
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