I understand about 3% of bowel polyps become cancerous, but to be on the safe side, all/most polyps are removed. Do you have a family history of bowel cancer, especially with people under 60?
I don't have colonoscopies, an informed decision, I weighed up the pros and cons and decided not to have them. All cancer screening carries risk and hopefully, a chance of benefiting, but it's a choice, one that legally and ethically requires informed consent. The problem is, IMO, we don't get a balanced presentation of the risks and benefits, in fact, some of the official discourse is biased in favour of screening.
Women are often told to just have their pap tests and mammograms. I've declined both, based on the evidence.
A small group of women aged 30 to 60 who test HPV+ have a small chance of benefiting from a 5 yearly pap test, everyone else is simpy exposing themselves to the risk of a false positive, excess biopsy or over-treatment. You can self test for HPV too, no need for speculum exams. The Dutch program is evidence based, they offer 5 HPV tests or self-tests at ages 30,35,40,50 and 60 and a 5 yearly pap test is only offered to the roughly 5% who test HPV+...
I decided against mammograms because the evidence suggests the risks with screening exceeds any benefit - the Nordic Cochrane Institute, an independent, not for profit, medical research group, have an excellent summary of the evidence on their website. I'd recommend it to all women.
About 50% of screen-detected breast cancers are over-diagnosed, and any benefit of screening is wiped out when you consider women who die from other cancers or heart events after treatment.
Bowel screening - screening does not reduce all-cause mortality, I found that concerning, there is also the small risk of perforation. I'd get a second or even third opinion, my husband has them every 10 years because he has a family history of bowel cancer, although they were all older people. Anyway, he decided to have a colonoscopy 10 yearly and uses a FOBT every 2 years.
We're all different and will take a different view with screening but the important thing is to understand what you're accepting as far as risk and actual benefit is concerned.
Three yearly sounds excessive to me, I'd be getting another opinion. My brother-in-law has had polyps removed, he has a colonoscopy every 5 years.