IgA nephropathy, when classified according to the World Health Organization, is divided into five stages. Stage 2 IgA nephropathy generally indicates that the patient has a relatively mild condition, with only mild lesions. More than half of the glomeruli are normal, and only a small portion of the glomeruli show increased mesangial cells and glomerulosclerosis. Generally, crescent formations do not occur. Clinically, patients with Stage 2 IgA nephropathy typically exhibit proteinuria and hematuria, usually with normal blood pressure and normal kidney function. Therefore, for patients with Stage 2 IgA nephropathy, it is crucial to maintain a regular lifestyle, avoid infections and fatigue, and refrain from using nephrotoxic drugs. In cases of infection, it is important to actively control the infection. Of course, if the patient's proteinuria exceeds 0.5g, angiotensin-converting enzyme inhibitors can be used to reduce proteinuria and simultaneously protect kidney function.