Chronic nephritis can have several pathological types, classified as thylakoid proliferative glomerulonephritis (including IgA and non-IgA thylakoid proliferative glomerulonephritis), thylakoid capillary glomerulonephritis, membranous nephropathy, and focal segmental glomerulosclerosis. A few of these non-IgA tegumentary proliferative glomerulonephritis may be converted from intracapillary proliferative glomerulonephritis. In advanced stages of the disease, all of the above-mentioned pathological changes can be transformed into glomerulosclerosis of varying degrees, with tubular atrophy and interstitial fibrosis in the corresponding renal units. In advanced stages of the disease, the kidney volume shrinks and the renal cortex becomes thin, and all pathological types can be transformed into sclerosing glomerulonephritis.