Our expert says:
If the blood is coming from your rectum, you definitely need a colonoscopy. If the blood is only there when you go to the toilet for a bowel action, then it is likely that it is coming from your rectum. The other thing you can do is lie down with a mirror when you have the bleeding and wipe the blood away till you can see where it is coming from. Endometriosis can occur in the colon which might explain why the bleeding occurs just before your period.
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