The traditional classification classifies prostatitis into four categories: acute bacterial prostatitis (ABP), chronic bacterial prostatitis (CBP), chronic non-bacterial prostatitis (CNP), and prostatodynia (PD). The new classification was developed in 1995 by the American Society for Prostate Cancer. The new classification was proposed by the National Institutes of Health (NIH) in 1995. Type I: Equivalent to the traditional classification of ABP, with an acute onset of febrile illness, persistent and marked lower urinary tract infection, elevated white blood cell count in the urine, and positive bacterial cultures in the blood or/and urine. Type II: Equivalent to CBP in the traditional classification method and accounts for approximately 5-8% of chronic prostatitis. There are recurrent symptoms of lower urinary tract infection lasting more than 3 months with positive bacterial culture results. Type III: chronic prostatitis/chronic pelvic pain syndromes (CP/CPPS), equivalent to CNP and PD in the traditional classification method, is the most common type of prostatitis, accounting for about 90% or more of chronic prostatitis. The main manifestation is prolonged and recurrent pain or discomfort in the pelvic region lasting for more than 3 months, which may be accompanied by varying degrees of urinary symptoms and sexual dysfunction, seriously affecting the patient’s quality of life. According to the results of routine EPS/semen/VB3 microscopy, this type can be subdivided into two subtypes, IIIA (inflammatory CPPS) and IIIB (non-inflammatory CPPS): type IIIA patients have elevated leukocyte counts in EPS/semen/VB3; type IIIB patients have leukocytes in EPS/semen/VB3 in the normal range. The two subtypes IIIA and IIIB each account for about 50% of the cases. Type IV: asymptomatory inflammatory prostatitis (AIP). The only evidence of inflammation is found on examination of the prostate (EPS, semen, prostate tissue biopsy and pathology of prostatectomy specimens).