Anyone get blood in their stool after a long run? I've read a bit online and it sounds fairly common among long distance runners. It has begun to happen to me after my last two long runs of 8km or more. Very annoying but not particularly worrisome. Has never happened any other time and I'm healthy in all other ways. Hesitate to go to the doctor because I'll end up a battery of unpleasant tests which will likely not yield anything helpful.