I have irritable bowel, how often should a colonoscopy be performed?

I am female and 65. I have irritable bowel. I have hemorrhoids that sometimes bleed – maybe every 7 to 8 weeks or so. Sometimes I can go for months with no bleeding. If I get constipated, I may have the bleeding. I have had in my life 3 colonoscopies all clean -no polyps. The last one was in 2011. So, when you have a patient that does bleed every so often, how often should a colonoscopy be performed? No family history.

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