Re: Is colon cancer common in your early 30's?
I initially presented with rectal bleeding when doing number 2s - one time only. I was told I was too young for cancer and to take 3 days of stool samples to pathology as it was thought it was a bacterial infection (that was after physical examination to rule out haemmorhoids), the path came back as no red or white blood cells present in the samples and I was a perfectly healthy 31 year old. I said to GP "but I know there wassomething red in one of those samples if not rbc what?" She then referred me to a Gastroenterologist for a colonoscopy that found the cancer. There's no family history of bowel or any other type of cancer in my family either. Tell your GP you want a referral for further investigation - you're paying, demand it, if no luck go elsewhere. The thing about colorectal cancer is it's th only cancer that can be cured if caught early enough - that's cure not remission.
Good luck and I hope you get some resolution soon.