Urine leukocytes may be the cause of: First, the existence of urinary tract infections. There are a variety of pathogenic bacteria caused by urinary tract infections, the body’s leukocytes will tend to infected parts of the phagocytosis of pathogenic bacteria, such as leukocytes into the urine, phagocytosis of pathogenic bacteria through the urine examination after the discovery of the relevant positive indicators, phagocytosis of pathogenic bacteria of the leukocytes at this time transformed into pus cells, along with the urine is discharged to the outside of the body. Second, if the urine is contaminated by external pollutants, this may cause an increase in leukocytes in the urine. Such as urination process by the urethral opening, glans or vulva and other parts of the presence of colonizing bacteria and contamination may appear after leukocytosis, retention of urine specimens in the process of the vessel caused by the relevant contamination, can also be caused by more leukocytes in the urine, but at this time the patient does not have the relevant symptoms, can be identified. Third, if there are stones, polyps, tumors and other related diseases of the urinary tract, secondary leukocyte elevation can occur. At this time, mainly to mucosal destruction, can be secondary to infection caused by the number of leukocytes in the urine increased.