What does it mean if a urine test shows occult blood?

The presence of occult blood in urine, medically referred to as hematuria or urinary red blood cells, may be caused by various factors. The following are some common causes: 1. Problems in the urinary system, such as the kidneys, bladder, or urethra—for instance, kidney inflammation, kidney stones, bladder inflammation, or tumors—can damage blood vessels, allowing red blood cells to enter the urine. 2. Strenuous exercise, menstruation in women, certain medications, or foods may temporarily cause a positive result for occult blood in urine. 3. Certain systemic diseases, such as blood disorders, lupus (an autoimmune disease), or even some infections, can also lead to the presence of occult blood in urine. Note: If occult blood appears in the urine, it should not be ignored, and timely medical attention is necessary.