Urinary tract infections (UTIs) are among the most commonly encountered bacterial illnesses. In adults, UTIs can be classified into acute uncomplicated cystitis, acute uncomplicated pyelonephritis, complicated UTI, and acute complicated pyelonephritis. For men, several categories of prostatitis are distinguished. The term “uncomplicated” usually reflects UTIs in premenopausal, non-pregnant women with no known anatomical or functional urological abnormalities or other comorbidities. Some authors advocate thinking about UTIs in postmenopausal women or women with well-controlled DM without urological sequelae also to be “uncomplicated”. Given these various classifications of UTIs in the literature, it likely makes more sense to classify these patients uniformly according to their presentation, in which fever reflects the presence of a parenchymal inflammation.