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Thanks. Now another question: what about a one-time visible bleed that seems to have been correlated with an unusual physical stress (exercise, etc.). How does this correlate with tumors? Can a tumor be stressed into bleeding only once?
Is there any knowledge/studies on physical activity/mechanical stress and rectal bleeding? For example, an individual who has had a few isolated incidents of bleeding (yes they need to have a colonoscopy), that in every case occurs in conjuction with an unusual physical/strenuous activity.
If you would like to answer this I will "Rate to finish". If you would like a separate ticket for this question, that is fine too.
Thanks for the responses both of you. It's good to see debate and cited sources based on both people's experience and knowledge.