The rules for a diagnostic approach to non-acute prostatitis, as applied during a one-year trial in this Division of Urology, are reviewed and their results on a clinical ground of 150 cases are discussed. In fact, this clinical conditions is apt to present often some problems, as far its cure is concerned, due to its variety of symptoms, and not seldom to un-correct previous therapeutic approach, for defect of a precise diagnostic appraisal.