Pyelonephritis can be diagnosed by performing relevant tests such as routine urine, urine bacterial culture, blood routine and renal ultrasound. Pyelonephritis is an infectious disease due to pathogenic microorganisms, and patients will have fever and chills, urinary frequency, urinary urgency, urinary pain (urinary tract irritation sign), lumbar pain, and percussion pain in the renal region. Patients with the above symptoms, and the presence of leukocytes, nitrate reduction test, urine bacterial culture colonies greater than 10⁵ / ml, blood routine suggests that the blood white blood cell count, C-reactive protein, as well as elevated calcitonin and accelerated sedimentation, etc., the possibility of pyelonephritis is considered to be high. Some patients have atypical clinical symptoms, which need to be localized according to laboratory tests and renal ultrasound. Pyelonephritis is suggested by a positive urine culture after bladder irrigation, the presence of leukocyte tubular pattern in the urine sediment examination and the exclusion of interstitial nephritis, lupus nephritis and other diseases, and the manifestation of renal insufficiency. The diagnosis of pyelonephritis should be carried out under the guidance of professional physicians, do not diagnose blindly on your own, so as not to affect the condition.