A urinary tract infection (UTI) is an umbrella-like term referring to an infection of any part of the urniary tract. This includes bladder infections, often referred to as "cystitis" or "simple cystitis" and kidney infections. Symptoms of UTIs include a frequent urge to urinate with little result, burning during urination, and dark and/or cloudy urine. In more serious cases, symptoms can include fatigue and shakiness, and fever or chills.