Chronic Prostatitis
There are two main types of chronic prostatitis: chronic bacterial prostatitis (caused by chronic bacterial infection) and nonbacterial prostatitis. 
Chronic Bacterial Prostatitis, is similar Acute Bacterial Prostatitis, in that it exhibits many of the same symptoms, but they develop more slowly and the prostatitis symptoms are generally less severe than in ABP. Chronic Bacterial Prostate Infection is a rare condition affecting only 5% or less of patients who develop one of the four forms of prostatitis.
Chronic nonbacterial prostatitis is also called chronic pelvic pain syndrome. It presents symptoms of prostatitis with negative result after urine culture and other test. It do not have any evidence of a bacterial infection, but men have the symptoms of prostate infection.
Causes of chronic prostatitis
Chronic prostatitis is usually caused by a chronic bacterial infection of the prostate gland. It may occur with or follow Epididymitis, Acute prostatitis, Urethritis, Urinary tract infection that often returns (is recurrent). The causes of nonbacterial prostatitis are not well described or understood in western medical system.
Treatment for chronic prostatitis
If you suffer from chronic prostatitis, antibiotic is not suggested. Hebral medicine Diuretic and Anti-inflammatory Pill is the effective medicine for treating chronic prostatitis.