What causes nonbacterial prostatitis if not germs?

Unknown.: Nonbacterial prostatitis is a generic term given to a syndrome of pelvic pain and urinary symptoms that is often very difficult to classify, work up, and treat. Though many common & uncommon germs have been investigated, the causes are still not known. Proposed mechanisms include inflammation, autoimmune reaction, neuropathic pain, trauma, anxiety, & stress.