Prostatitis is inflammation of the prostate gland that is caused by infectious agents like bacteria or other conditions. There are four main types: acute bacterial prostatitis, chronic bacterial prostatitis, chronic prostatitis/chronic pelvic pain syndrome where the cause is unclear, and asymptomatic inflammatory prostatitis. Prostatitis causes symptoms like perineal pain and difficulty urinating and is most common in men under 50. Treatment involves antibiotics, alpha-blockers, pain medication, and sitz baths. Chronic forms are difficult to treat due to poor antibiotic diffusion into prostatic fluid.