Chronic prostatitis is caused by a bacterial infection.
The disorder is diagnosed in 5 out of 1,000 outpatient visits. Increased risk is associated with men over 30 years old. Certain factors may predispose a person to develop chronic prostatitis, such as excessive alcohol intake, perineal injury, and certain sexual practises. It is hypothesised that these factors may cause congestion of the prostate gland which produces an excellent breeding ground for various bacteria. Those that are associated with sexually transmitted diseases may be prevented by practicing safer sex behaviors .