Home > Kidney Disease > Hematuria or Blood in the Urine Get the Flash Player to see this player. Rate: (Click the stars to rate) Published on Feb 03, 2010 by Neil Baum, Views: 3810 Hematuria or Blood in the Urine. Blood can come from anywhere from the kidneys to the bladder and the urethra. Most causes of hematuria are fairly benign, but cancer is the most worrisome cause. This always requires and evaluation by a physician.