Whether the back pain is nephritis or not should be judged according to clinical symptoms, relevant examinations and laboratory results. 1. Clinical symptoms: Nephritis is not a symptom of back pain, nephritis is caused by a variety of etiology and pathogenesis, including glomerulonephritis, IgA nephropathy, lupus nephritis and purpuric nephritis, etc. The main symptoms are facial swelling, hematuria, proteinuria, fatigue, increased blood pressure, and severe renal function impairment and other abnormalities. 2. Relevant examination: The diagnosis of nephritis requires a series of relevant examinations to confirm the diagnosis. Such as routine urinalysis, 24-hour urine protein quantification. As well as renal puncture and so on. 3. Laboratory results: all laboratory results support the diagnosis of nephritis, which can exclude other causes of low back pain, and need to go to the nephrology department of the hospital for systematic treatment. If patients have back pain, no matter what the situation is, they should go to the hospital in time to do the relevant examination, and after diagnosis by the doctor, active treatment.