blood in urine can't find cause
Blood in Urine Causes. 1  Infection: Blood in the urine can be a sign of urinary tract infection (UTI). 2  Nephrolithiasis: Kidney or bladder stones may form inside the urinary tract and can cause bleeding into the urine. 3  Kidney disease: Diseases of the kidney can be associated with blood in the urine. 4  Prostate gland enlargement: Enlargement of the 5  ... C Nephrolithiasis: Kidney or bladder stones may form inside the urinary tract and can cause bleeding into the urine. 2  Kidney disease: Diseases of the kidney can be associated with blood in the urine. 3  Prostate gland enlargement: Enlargement of the prostate can compress the urethra and partially block the flow of urine.