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Blood in the urine. It usually indicates injury or disease of the kidney or another structure of the urinary system or possibly, in males, the reproductive system. It may result from infection, inflammation, tumours, kidney stones, or other disorders. How the blood looks and when it appears in the urine stream reflect whether it originates in the urethra, the bladder, or the kidney.
This entry comes from Encyclopædia Britannica Concise. For the full entry on hematuria, visit Britannica.com.