The life expectancy of acute pyelonephritis is related to many factors such as the severity of the disease and the effect of treatment, and cannot be generalized. If patients undergo regular treatment early, life expectancy is usually not affected; if patients do not receive timely and effective treatment and develop serious complications such as infectious poisoning, or develop chronic pyelonephritis, which then progresses to chronic renal failure, life expectancy may be affected. Acute pyelonephritis is mainly an inflammatory disease caused by various pathogenic microorganisms invading the renal parenchyma and renal pelvis. It can be cured if the patient undergoes regular treatment early, and usually does not affect life expectancy. If acute pyelonephritis is not treated in time, or the treatment effect is not good, there may be complications such as renal pelvic pus, perinephric abscess, infectious toxicity, etc., or develop into chronic pyelonephritis, and then progress to chronic renal failure, which may affect the life expectancy, and the exact life expectancy is not generalized. Patients with acute pyelonephritis are advised to go to regular hospitals in time and receive standardized treatment under the guidance of doctors.