Nephrotic syndrome is a common manifestation of glomerular disease, caused by a variety of etiologies, with large differences in treatment response and prognosis. The pathological causes of nephrotic syndrome are diverse, with the most common types being minimal change disease, focal segmental glomerulosclerosis, mesangial proliferative nephritis, membranous nephropathy, and membranoproliferative glomerulonephritis. Nephrotic syndrome can be classified into primary and secondary types based on its cause. The diagnosis of primary nephrotic syndrome mainly depends on the exclusion of secondary nephrotic syndrome. Common causes of secondary nephrotic syndrome include diabetic nephropathy, lupus nephritis, renal amyloidosis, drug-induced nephropathy, and renal tumors.