Prostatitis is common and affects many men at some time. Prostatitis is an inflammation of the prostate gland. When part of your body is inflamed, it is red, hot and sore. Prostatitis can cause many symptoms. It can make it difficult or painful to urinate. It can make you have to urinate more often. It can also give you a fever, low-back pain or pain in your groin (the area where the legs meet your body). It may make you less interested in having sex or unable to get an erection or keep it. Prostatitis is easy to confuse with other infections in the urinary tract.