How long a patient with pyelonephritis can live is related to many factors such as the patient’s condition and the effect of treatment, and cannot be generalized. If the condition is mild and the treatment effect is good, it usually does not affect the life expectancy; if the condition is severe and the treatment effect is poor, serious complications such as infectious poisoning occur, or chronic pyelonephritis develops into chronic renal failure, the life expectancy may be affected at this time. Pyelonephritis belongs to upper urinary tract infection, most of the pyelonephritis is caused by bacterial infection, which can be divided into acute pyelonephritis and chronic pyelonephritis. Most mild cases as well as patients in the acute stage can be cured after active treatment. If it evolves into chronic pyelonephritis, it can also be treated to improve the symptoms, and if the treatment is effective, it usually does not affect life expectancy. However, 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 the condition of chronic pyelonephritis continues to progress, which may develop into chronic renal failure, at this time, life expectancy may be affected, but the specific survival time, cannot be generalized. Patients with pyelonephritis are advised to go to regular hospitals in time and standardize the treatment under the guidance of doctors.