The reason there is bleeding after colon polyp removal is that when the polyp is resected, what's left is basically an ulcer. As that ulcer heals, a blood vessel can be exposed and bleed.
Bleeding can happen during and after colon polyp removal. Immediate bleeding is usually easy to deal with using a variety of tools. Delayed bleeding matters most. It means that polyp removal is done, and everything looks nice and dry and clean. Bleeding starts after the person goes home. That risk is highest in the first three days, but it persists for up to two weeks. That risk overall is probably about 2 to 5 percent.
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