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It all sounds so easy when doctors talk about colonoscopies. Prior to my first colonoscopy, never in my life had I suffered hemmoroids. However, the first one resulted in a small hemmeroid. Some years later I had a second which exaserbated the problem--I was now a man suffering the joy of hemmorroids and all that entails.
Years later, diverticulitis required a sigmoid resection. I don't know what they shoved up my rectum, but whatever it was increased the hemerroid so that it now likes to protrude. This causes leakage problems, bleeding, and all the joys associated with this problem.
Conclusion: Medical procedures that require inserting hoses and other objects can damage the sensitive tissues and blood vessels around and in the rectum. I know... However, if one has certain symptoms, like dark blood, it might be necessary. Another less invasive way to just check out possible causes is with a barium treatment exam which a primary physician can order.