For me it was small amount consistently. But I cannot stress enough that it was the diagnosis of hemorrhoids coupled with a very proactive doctor that led to me being diagnosed with cancer. It was a lucky circumstance that it was staged early because the additionally suggested screening was not standard protocol for my age.

If you have any abnormalities in your bowel movements (blood, ribboning, etc.) and you have the ability to get it checked then it could offer peace of mind. And yes, there are small chances of intestinal perforations with a colonoscopy.