This is a very diffuse term, commonly used to describe a collection of symptoms characterized by the presence of pain or discomfort in the perigenital area (perineum, groin, testicular region) often radiating to the lower back or the inside of the thigh.
The location of discomfort may vary from individual to individual, and in the same individual at different occations.
A variety of micturitional symptoms from the lower urinary tract (frequent necessity to void, urgency, burning sensation at voiding, feeling of uncomplete emptying of the bladder, difficulties to keep completely tight, etc) may accompany the pain or dominate the picture. Many times, ejaculation is painful, or a crampy discomfort follows ejaculation

The subdivision according to Drach and colleagues is based on the analysis of the prostatic fluid (presence of white blood cells and/or micro-organisms):

1. Chronic Bacterial Prostatitis (CBP): presence of white blood cells and micro-organisms
2. Nonbacterial Prostatitis (NBP): presence of white blood cells, but no bacteria
3. Prostatodynia (PDy) ="painful prostate": normal count of white blood cells and absence of bacteria
Chronic bacterial prostatitis (CBP) is the least frequent condition with only around 5% of all patients affected by "chronic prostatitis"

Chronic Bacterial Prostatitis (CBP):

Nonbacterial Prostatitis (NBP):

Prostatodynia (PDy)

Prostatic massage

Chronic prostatitis can manifest vaguely as low back pain, perineal, testicular, or penile pain, dysuria, ejaculatory pain, recurrent UTIs with the same organism, or hematospermia.
Prostatitis is frequently abacterial; diagnosis requires identification of organisms by quantitative urine cultures before and after prostatic massage