re my last post - I'm sorry - you did state your age. As they say "more care less speed" (when reading....!!)
regards
Morecambe
You don't state your age. The more sinister causes of rectal bleeding generally only appear after age ~40 but, as Calgal states, you must get this checked out because rectal bleeding is never normal.
In order to provide yourself with maximum pre-consultation information, you could type in rectal bleeding to google/yahoo etc and click onto one of the many postings that describe rectal bleeding and its symptoms/causes/treatments etc etc.
Good luck
Morecambe
You need to see a gastroenterologist and request a colonoscopy be done in addition to other testing to find the cause of the blood. It's difficult to say what the cause could be, unfortunately. It could be fairly simple or much more complex.