Hematuria means blood in the urine. Normally, urine does not contain any blood. There are two kinds of hematuria:

  • Microscopic hematuria—Urine contains a very small amount of blood. It cannot be seen with the naked eye.
  • Gross hematuria—Urine appears red or tea-colored.

The Urinary Tract
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Hematuria can be caused by many conditions, such as:

  • Vigorous exercise
  • Injury to the abdomen, pelvis, or internal organs of the urinary tract
  • Conditions that affect the urinary tract, such as infection, vesicoureteral reflux, blockage or abnormalities, or tumors
  • Cancer of the kidney or bladder
  • Kidney disease
  • Kidney stones
  • Bleeding disorders, such as hemophilia
  • Certain congenital diseases, such as polycystic kidneys
  • Certain medications

Sometimes the exact cause is not found.