Why do I have blood in my urine?

Presence of blood in the urine will alarm anyone and raise suspicion of serious health problems. Blood in the urine is described in two ways: microscopic, in which blood is seen only under a microscope, or gross, in which the urine appears visibly red with blood.  

Blood in the urine is caused by a range of medical conditions, from mild to severe, and each episode needs to be evaluated by a doctor.