If there are white blood cells in the urine test, the possible causes: 1. Urinary tract infections, such as the occurrence of pyelonephritis, inflammation of the ureter or inflammation of the bladder and urethra, can lead to an increase in the number of white blood cells in the urine. This situation is often due to the pathogenic bacteria of the infection, the concentration in the urine increases, the body’s white blood cells will play its immune role to engulf these pathogenic bacteria, so there will be a high number of white blood cells present in the urine examination. In this case, the patient will generally have symptoms of urinary tract irritation such as frequent urination, urinary urgency or painful urination, which need to be further combined with urine culture to clarify what pathogenic bacteria infection, and can be targeted to select drugs for treatment. 2, the urine specimen is contaminated, such as the retention of urine specimens placed for too long, the specimen corruption or deterioration, or by other exogenous pollutants, resulting in a The patient will not be accompanied by symptoms and urinary tract irritation, and it is recommended to retrieve clean middle urine for re-examination.