@Moon Red blood sometimes is not alarming since that's closer to the anus. If there's lots and often with no apparent cause, you might want to look into it. Black poop means bleeding further up (enzymes break the hemoglobin into bilirubin*) so that should be investigated immediately. Hemorrhoids are benign usually, and you can get something for them from the pharmacy.
*This is the same stuff that causes alcoholics and other people with dysfunctional livers to turn yellow. The more you know!