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Most likely cause is internal hemorrhoids causing painless bleeding.
Hard stool can cause this commonly.
However given that this is going on for a week a clinical evaluation is recommended.
Sometimes this can be a sign of inflammatory bowel disorder.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable and authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/
Thanks for clarification.
Then this is likely not concerning.
Blood can come from an internal hemorrhoid which cannot be seen from outside.
Blood appears sometimes not always in hemorrhoid related condition.
Cancer is very unlikely --so do not worry about that.