Which of the following is a common symptom of an upper UTI?

Flank pain is a common symptom of an upper urinary tract infection (UTI), which primarily involves the kidneys and the ureters. In this context, the upper UTI generally refers to infections such as pyelonephritis. The kidneys are located in the flank area, and as the infection inflames the tissues surrounding these organs, patients often experience pain in the flank region.

This pain can vary in severity and may be accompanied by other symptoms, such as fever and chills, reflecting the systemic nature of the infection. The presence of flank pain serves as an important clinical sign, helping healthcare providers differentiate between upper and lower UTIs, which typically involve the bladder and urethra.

Other symptoms, such as painful urination, abdominal discomfort, and frequent urination, are more indicative of lower urinary tract infections. These symptoms arise from irritation and inflammation in the bladder and urethra, rather than in the kidneys. Therefore, recognizing flank pain as a hallmark symptom of an upper UTI is crucial in assessing and managing these infections appropriately.