Normally there is no bacteriuria in chronic nephritis. As the etiology, pathogenesis and pathological types of chronic nephritis are different, but the starting factor is mostly immune-mediated inflammation. Clinically, it usually manifests as hematuria, proteinuria, edema, hypertension, and renal function impairment. Patients with chronic nephritis usually do not show bacteriuria when doing urinalysis. Unless the patient is combined with urinary tract infection. Most of the bacteriuria is caused by the massive reproduction of bacteria in the urinary tract after urinary tract infection, and the urine flushes out the bacteria in the urinary tract during urination. It is usually combined with urinary frequency, urgency, urinary pain, fever, chills, back pain and other symptoms. It is recommended that patients with chronic nephritis and bacteriuria go to regular hospitals in time to improve the relevant examinations and follow the doctor’s instructions for targeted treatment.