it could be piles which is quite common.if it carries on for a long time, go and see the dr to get it checked.im sure its nothing to worry about. keep smiling :-)
It could be an internal hemorrhoid.
Whwn blood is bright red that usually means it's "fresh" blood. Could be hemroids but you should never mess with rectal bleeding. A very simple test can be done in a Dr.s office to tell.
Usually a hemorroid will cause this. Do you notice the bleeding after an episode of constipation?