How long does a UTI last for?

When treated.... Since uti's are painful, effective therapy can alleviate the symptom of pain/burning on urination within a day. However, other symptoms, depending on the severity of infection, may take up to a week (fever, malaise) or so to abate (eg.Flank pain).If symptoms are gone in a few days, it is important to complete the prescribed course! or else you risk getting a recurrence of the infection.