Nephrotic syndrome is more serious than nephritis, because nephritis syndrome may have serious lethal complications. The first is infection, because patients with nephritis syndrome have severe hypoproteinemia as well as oral immunosuppressant for treatment, which will make their resistance significantly reduced, and the infection will not be easily controlled after it occurs, and severe infection may occur. Secondly, patients with nephritis syndrome may develop acute kidney injury, which means that the blood creatinine rises significantly in a short period of time, kidney function deteriorates, and even oliguria or anuria occurs, and if necessary, kidney replacement therapy such as hemodialysis may be required. There are also complications of thrombosis or embolism that may occur in patients with nephritis syndrome, and even pulmonary infarction and myocardial infarction, which can be serious and life-threatening. In addition, the reason why nephritis syndrome is said to be serious is that when nephritis syndrome is treated, there may be some pathological types that are poorly treated, and with persistent proteinuria, there will be damage to kidney function, which may eventually progress to chronic renal failure or even uremic stage.