Re: hemroids or colon cancer
I would guess you've probably got a polyp, most likely a rectal polyp, but you are too young??? I had my 50th birthday colonoscopy present from my doctor recently and they found a rectal polyp. I had the same symptoms as you, itching and occasional bleeding for the last 5 years or so. Occasional bleeding is a common polyp symptom. The itching baffled me as it would get fairly intense at times.
But at 21? Polyps are slow growers and if you have one, it means it's probably been growing since you were pretty young! I'm no doctor and along with your age they may continue to dismiss it, but I'd want a doctor to have a look up there. Ask again, I get ****** off when doctors dismiss what I try to tell them.