Can a UTI Cause Back Pain?

Yes, a UTI can cause back pain when the infection spreads to the kidneys. Lower urinary tract infections typically cause bladder symptoms like burning and frequent urination, but when bacteria travel upward to the kidneys, it creates pyelonephritis. This kidney infection causes flank pain in the lower back, often on one side. An untreated UTI can sometimes spread to the kidneys, although the risk varies from person to person. Back or side pain may occur with fever, chills, nausea, or urinary symptoms, but not everyone has all of these symptoms. Kidney infections require immediate medical attention as they can lead to serious complications including sepsis.