Pyelonephritis can cause kidney failure when it is severe or if it is not cured for a long time. If the treatment of pyelonephritis is not timely and thorough or if you do not pay attention to personal hygiene, hold urine, and love to eat spicy and irritating foods, pyelonephritis may recur and not heal over time, and may turn into chronic inflammation. If the inflammation is prolonged, it will cause kidney damage and the patient will experience kidney failure. At this time, the kidney function check shows elevated urea nitrogen and creatinine, and patients will have a small amount of anuria, swelling and other serious symptoms. If it reaches the stage of uremia, patients will have to undergo dialysis treatment.