Oct 04, 2011 · Blood in urine, also called hematuria, is a serious symptom you should investigate immediately. Learn more about the possible causes of blood in urine at WebMD.
In some cases, no cause of hematuria may be found (idiopathic hematuria) Structural Causes of Hematuria Kidneys that contain cysts (fluid-filled sacs) or are blocked may lead to any type of hematuria. An ultrasound of the kidney can determine if an abnormal structure is causing blood in the urine. Inherited Causes of Hematuria.
Blood in the urine in children is discussed separately (see "Patient education: Blood in the urine (hematuria) in children (Beyond the Basics)"). More detailed information is available by subscription. (See "Etiology and evaluation of hematuria in adults".) TYPES OF HEMATURIA. There are two main types of hematuria: gross and microscopic.