There are many theories about the cause of nonbacterial prostatitis: fungi, viruses, trichomonads, and obligate anaerobic bacteria have been suspected. Irritation caused by a reflux of urine flowing into the prostate may also be a cause. Up to 65% of patients with chronic prostatitis have the nonbacterial form. The disorder is seen in 5 of every 10,000 outpatient visits by men.
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