There is no such thing as early symptoms of chronic pyelonephritis. Patients with chronic pyelonephritis may present with vague pain in the lumbar region, intermittent urinary frequency, and low-grade fever. Chronic pyelonephritis is more complex, the systemic and localized urinary manifestations are atypical, and sometimes only asymptomatic bacteriuria is manifested. More than half of the patients may have a history of acute pyelonephritis, followed by low-grade fever, intermittent urinary frequency, urinary discomfort, lumbar pain, and impaired renal tubular function, such as nocturia, hypogranulonephrosis, etc. The disease may progress to chronic pyelonephritis. Persistence of the disease may progress to chronic renal failure. The patient’s symptoms are obvious during acute attacks, similar to acute pyelonephritis. Patients with chronic pyelonephritis are advised to consult regular hospitals and receive standardized treatment under the guidance of physicians.