Question: What causes Hematuria (Blood in the Urine) ?
Answer: Hematuria can be caused by menstruation, vigorous exercise, sexual activity, viral illness, trauma, or infection, such as a urinary tract infection (UTI). More serious causes of hematuria include - cancer of the kidney or bladder - inflammation of the kidney, urethra, bladder, or prostatea walnut-shaped gland in men that surrounds the urethra at the neck of the bladder and supplies fluid that goes into semen - polycystic kidney diseasean inherited disorder characterized by many grape-like clusters of fluid-filled cysts that make both kidneys larger over time, taking over and destroying working kidney tissue - blood clots - blood clotting disorders, such as hemophilia - sickle cell diseasean inherited disorder in which RBCs form an abnormal crescent shape, resulting in less oxygen delivered to the bodys tissues, clogging of small blood vessels, and disruption of healthy blood flow
Source: NIDDK