Chronic interstitial nephritis usually does not develop quickly, with a long course and insidious onset, often progressing slowly to chronic renal failure. Chronic interstitial nephritis, also known as chronic tubulointerstitial nephropathy, belongs to a kind of disease with tubular atrophy, different degrees of cellular infiltration and interstitial fibrosis as the main clinical manifestations, the main clinical manifestations of renal tubular function damage, the onset of insidious, slow development, the pathology is also characterized by chronic disease as the main manifestation of the renal tubular atrophy, renal interstitial fibrosis is prominent. If the condition of chronic interstitial nephritis is not controlled, it may cause renal tubular acidosis and renal diabetes mellitus, and proteinuria, anemia, and aseptic leukocyturia may also occur. Chronic interstitial nephritis usually develops slowly, but it can gradually progress to chronic renal failure, so it is recommended that patients actively go to regular hospitals to receive examination and treatment, so as not to delay the condition.