NIH Classification and Definition of Prostatitis [Contemporary urology Dec 1999:7] I. Bacterial prostatitis: acute infection of the prostate gland. II. Chronic bacterial prostatitis: recurrent urinary tract infections; chronic infections of the prostate. III. Chronic nonbacterial prostatitis (chronic pelvic pain syndrome) pain or discomfort in the pelvic region (for at least 3 months) accompanied by various symptoms in urination and sexual life. IIIa, Inflammatory chronic pelvic pain syndrome: presence of leukocytes in semen, prostatic fluid or VB3. IIIb, Non-inflammatory chronic pelvic pain syndrome: absence of leukocytes in semen, prostatic fluid or VB3. IV, asymptomatic inflammatory prostatitis: no subjective symptoms; no leukocytes in prostate biopsy, semen prostate massage fluid or VB3.