Three plus white blood cells in the urine of female patients often indicate the presence of urinary tract infections. Urinary tract infections are a disease with a high incidence in female patients, and the main common ones are bacterial cystitis, atopic cystitis, and urinary tract tuberculosis. Bacterial cystitis is caused by bacterial infection, most patients are young women, due to frequent sexual life, if not pay attention to personal hygiene, it is easy to cause a decrease in resistance, which allows bacteria to infect the bladder mucosa through the urethra, thus causing an increase in white blood cells in the urine. The causes of atopic cystitis are complex, and the common clinical causes include adenoidal cystitis, interstitial cystitis, and radiation cystitis. In addition, urological tuberculosis is also a common cause of leukocytosis in urine, and urinary tract tuberculosis is caused by the metastasis of primary tuberculosis such as pulmonary tuberculosis.