Prostatitis is classified into acute, chronic, asymptomatic inflammatory prostatitis, and chronic pelvic pain syndrome. Complications for symptomatic men include urethritis, prostatitis, epididymitis, and infertility. Acute prostatitis is a serious bacterial infection of the prostate gland. Prostatitis is inflammation of the prostate gland. "Trichomonas vaginalis" infection in males has been found to cause asymptomatic urethritis and prostatitis. Acute prostatitis may be a complication of prostate biopsy. Acute prostatitis and chronic bacterial prostatitis are treated with antibiotics. The histologic correlate of acute prostatitis is a neutrophilic infiltration of the prostate gland. The prostate condition was also described as a stress-related prostate condition, prostatitis. Prostatitis (inflammation of the prostate) may also be considered in the differential diagnosis. Older terms for this condition are "prostatodynia" (prostate pain) and non-bacterial chronic prostatitis. The term "prostatitis" refers to inflammation of the tissue of the prostate gland. The evidence supporting a viral cause of prostatitis and chronic pelvic pain syndrome is weak. In studies of 656 men, we seldom found chronic bacterial prostatitis. This is known as chronic prostatitis.