IgA nephropathy is a pathological type of chronic glomerulonephritis, which can cause patients to exhibit symptoms such as proteinuria and hematuria. Regarding the characteristics of proteinuria, it is generally primarily glomerular proteinuria. In the classification of patients' proteinuria, glomerular proteinuria accounts for a large proportion. If IgA nephropathy presents as chronic nephritis or nephrotic syndrome, the patient's level of proteinuria will be quite severe, with significant amounts of proteinuria, where the 24-hour urinary protein quantification may exceed 1g or even reach more than 3.5g. However, not all patients with IgA nephropathy have such high levels of proteinuria; some may only have mild proteinuria.