IgA nephropathy is a type of chronic nephritis. Patients with this disease have inflammatory reactions within their glomeruli. This inflammation is caused by the deposition of IgA immune complexes in the glomeruli. The reason why patients are prone to IgA immune complex deposition is still not very clearly explained in current medical literature and remains unclear. It is possible that such patients produce defective IgA immunoglobulins, often related to mucosal inflammatory infections, such as tonsillitis, enteritis, proctitis, etc. Inflammation of these mucosal areas might cause defective secretory IgA to circulate through the bloodstream to the kidneys, triggering an inflammatory response. The production of defective IgA immunoglobulins in patients may be related to genetic and environmental factors, but the specific mechanism is still not very clear.