Seeing blood in your urine can cause more than a little anxiety. Yet blood in urine — known medically as hematuria — isn’t always a matter for concern. Strenuous exercise can cause blood in urine, for instance. So can a number of common drugs, including aspirin. But urinary bleeding can also indicate a serious disorder.
There are two types of blood in urine. Blood that you can see is called gross hematuria. Urinary blood that’s visible only under a microscope is known as microscopic hematuria and is found when your doctor tests your urine. Either way, it’s important to determine the reason for the bleeding
For causes of Hematuria go to http://www.cnn.com/HEALTH/library/blood-in-urine/DS01013.html