IgA nephropathy is a common glomerular disease and a major cause of uremia. However, the exact cause of IgA nephropathy is not very clear. Current research suggests that it is caused by factors such as infections which stimulate the production of autoantibodies, forming immune complexes that deposit in the glomeruli. This leads to inflammation of the glomeruli, eventually stimulating mesangial cell proliferation and accumulation of extracellular matrix, causing glomerulosclerosis and interstitial fibrosis. IgA nephropathy is a very covert disease, often presenting as asymptomatic hematuria or increased urine protein. Many patients discover this condition incidentally during physical examinations. Some individuals have a history of upper respiratory or gastrointestinal infections before the onset of the disease, followed by the discovery of gross hematuria. IgA nephropathy is more common in children and adolescents.