IgA nephropathy is the most common primary is glomerular disease and the leading cause of renal failure. In our country, this disease accounts for fifteen to forty percent of primary glomerulonephritis. It is said to be versatile because its clinical manifestations are very diverse and complex, and the prognosis varies greatly. Some of them only show a few red blood cells in the urine, and they will live a lifetime without any problems. Some of them will soon develop acute failure and uremia. According to its clinical manifestations, nephrologists classify the disease into seven types: the first is hematuria. It is the most common manifestation in the early stage. It is manifested as transient or recurrent episodes of hematuria or microscopic hematuria. Most of them are triggered by upper respiratory tract infections, and some are due to inflammation of the gastrointestinal tract or urinary tract infections. This type accounts for about one-fifth of the disease. The second is the proteinuric type. This type is predominantly proteinuric, mostly presenting as mild proteinuria with a twenty-four hour proteinuria quantification of less than one gram. It is interesting to note that a minority of patients in this type (about one tenth to one quarter) do not have hypoproteinemia despite having large amounts of proteinuria. This is significantly different from other chronic kidney diseases. The third is the nephrotic syndrome type. This type accounts for about one-fifth of the cases. It is more common in children and adolescents. As you may know, the typical manifestations of nephrotic syndrome are three highs and one low. The three highs refer to high swelling, large amount of proteinuria, hyperlipidemia, and one low refers to hypoalbuminemia. The fourth type is hypertension. This type of hypertension is more prominent, and most of the kidney function will deteriorate rapidly, and hypertension itself is an important factor in the deterioration of kidney function. This type is mostly seen in older patients, and the incidence in children is only 5%. The fifth is the type of renal impairment. The main manifestation of this type is chronic renal failure, with a few patients showing acute renal failure. Chronic renal failure occurs mainly in adults, mostly after ten to twenty years after diagnosis, and is less common in children. The sixth one is acute nephritis syndrome. This type is less frequent, and most patients show persistent hematuria, large amount of proteinuria, edema, mild and moderate hypertension, and rapid deterioration of renal function within a short period of time. If a kidney biopsy is done, a large number of crescentic bodies can often be seen. The seventh is a poorly categorized type, and this type is less common. It presents as severe back pain and severe stomach pain, both at the same time, or independently. Of course, the usual ones are accompanied by hematuria.