The literal translation of the term "piuria (leukocyturia)" - "pus in the urine" (Greek pyos - pus, uros - urine). The true meaning of the term "pyuria" is acquired in patients with pionephrosis, when antegrade arbitrary drainage into the bladder occurs. Piuria is evidence that an acute inflammatory process develops in the organs of the genitourinary system - cystitis, pyelonephritis, prostatitis, pionephrosis and other diseases.