What does it mean if you have a trace of occult blood in urine?

Runs the gamut...: The fact that it is a trace amount is the best news - just keep an eye on it. The fact that there is blood in your urine may indicate kidney stone, infection, prostate cancer, or the simple act of running or driving daily and causing the minor bouncing trauma of those activities that cause your kidneys to leak a little blood. Could be something, could be nothing. Something to follow, though.