Which of the following is a symptom of a urinary tract infection (UTI)?

A urinary tract infection (UTI) commonly presents with several characteristic symptoms, including flank pain, malaise, fever, and cloudy urine. Flank pain can occur if the infection affects the kidneys, while malaise and fever are systemic responses to infection. Cloudy urine is often indicative of the presence of bacteria, pus, or other inflammatory markers in the urine, which is typical in UTIs.

Other symptoms, such as hematuria (the presence of blood in the urine) can occur in some cases of UTIs, particularly if there is irritation to the urinary tract. However, it is not universally present and is not as classic a symptom as those mentioned. Sudden weight loss is not typical in the context of a UTI and might suggest other underlying conditions. Shortness of breath may occur due to unrelated causes but is not associated with UTIs.