You have to get a colonoscopy. They can help you if it's not to late. If you do nothing, then your going to risk your health. Just do it! Don't be a idiot and decide to do nothing. Bleeding through your anus is not normal. Don't you want a piece of mind?
Please seek medical advice because rectal bleeding is never normal. Type in rectal bleeding to google/yahoo etc to find a posting that described symptoms, causes, treatments etc etc.
Depending on your age, causes can be more minor - but the more sinister causes tend to occur after age ~ 40.
If your dcotor is at all vague, then I suggest that you insist on a colonoscopy.
regards
Morecambe
bright red or dark dlack color?