Urine occult blood + usually indicates an increase in red blood cells in the urine, and the number of red blood cells in normal urine is less than 3 per high magnification. When the red blood cells in the urine are abnormally high, routine occult blood + in urine will occur, often indicating the presence of bleeding in the urinary tract. There are many diseases that can cause this condition to occur, such as common urinary tract infections such as cystitis and pyelonephritis that can cause an increase in red blood cells in the urine. Urinary stones, such as kidney and ureteral stones, can also cause the occurrence of hematuria. Early urological tumors, such as bladder tumors and kidney tumors, can also increase red blood cells in the urine causing hematuria. Therefore, the occurrence of occult blood in urine + should be judged comprehensively according to the patient’s other accompanying symptoms, and further examination should be done to clarify the cause if necessary.