Our expert says:
Firstly - did your doctor do a rectal examination, feeling into the rectum with a finger ? I know this sounds gross but is really important. 90% of cancers in the anus can be felt with this examination. Secondly one should have an examination under anaestetic called a sigmoidoscopy if the bleeding does not stop and is not coming from an obvious hemorroid - it could be a diverticle or tumour bleeding and serious causes need to be excluded 100%. Hemorroids can bleed but rarely more than a teaspoon at a time - mostly just a streak on the paper.
See also http://www.medicinenet.com/rectal_bleeding/article.htm
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