Nonbacterial Prostatitis, as far as we know, does not involve bacteria. It is the most common form of prostatitis, and it’s a diagnostic puzzler: Nobody knows what causes it, and antibiotics don’t make it go away. Its symptoms are often indistinguishable from those of chronic bacterial prostatitis: Difficult, frequent, urgent, burning or painful urination; and acute or vague pain in areas including the lower back, perineum (the area between the rectum and scrotum), penis, scrotum, and pubic region. Most men who get nonbacterial prostatitis never have had a urinary tract infection. White blood cells appear in the prostatic fluid, but the urine shows no evidence of infection.
Prostatodynia produces symptoms that are basically identical to those of nonbacterial prostatitis; the difference is made in diagnosis (see below). Prostatodynia can be caused by many things, particularly muscle spasms in the bladder neck, prostatic urethra, perineum, or pelvic floor.