This happened to me last year but I was pretty sure it was just dehydration. Anyways, for the past 3 runs now I've been pissing blood. It doesn't hurt at all and the first time I thought it was just because I was dehydrated but I know for a fact that the past two times I was quite well hydrated. Anyone got some suggestions what it could be for a college age male. I'll probably be making an appointment monday to see my doc.