Acute pyelonephritis has the possibility of recurrence after treatment. Patients with acute pyelonephritis whose symptoms disappear after treatment and whose urine is negative for bacteria appear again within 6 weeks, with the same strain of bacteria as in the previous infection and the same serotype, are called relapsing. The reason may be that the last treatment is incomplete or there is urinary tract deformity and so on, so that there is still a small amount of bacteria in the body. At this time, we need to choose sensitive antibiotic treatment according to the results of drug sensitivity, and if repeated recurrence, we need to try low-dose bacteriostatic therapy. Usually need to pay attention to drink more water, urinate more often, do not hold urine for a long time, the flushing effect of urine can also help to prevent the recurrence of acute pyelonephritis. And actively search for triggering factors and remove them, such as treating urinary stones, urinary tract obstruction and so on. When acute pyelonephritis occurs, it is recommended to consult a doctor in time and take active treatment under the guidance of a physician.