Clinically, patients may take the initiative to tell doctors when they visit them that I have IgA nephropathy, or that I have membranous nephropathy, or that I have mild thylakoid proliferative nephritis, and so on. In fact, the patient is talking about the pathological diagnosis of kidney disease, not the clinical diagnosis. These pathological diagnoses, in general, can be classified into the clinical diagnosis of chronic nephritis. Chronic nephritis is short for chronic glomerulonephritis, which can be caused by many causes and consists of many different pathological types, and is a large group of diseases, not a disease. Chronic nephritis can have varying degrees of proteinuria, hematuria, tubuluria, edema, hypertension, and renal insufficiency, and its etiology is not well understood. Chronic nephritis has the following taxonomy according to the pathology: 1. According to whether there is IgA in the kidney tissue, it can be divided into IgA nephropathy and non-IgA nephropathy. So, what is IgA, if you speak carefully that half a day can not be finished. Simply put, it is a kind of protein, know this point on the line. 2, according to the location of the kidney tissue hyperplasia, the degree of hyperplasia, and the presence of sclerosis, etc., can be divided into five diagnoses: ① thylakoid proliferative nephritis; ② diffuse or focal proliferative nephritis; ③ membrane nephritis (also called membrane nephropathy); ④ focal segmental glomerulosclerosis; ⑤ membrane proliferative nephritis. In conclusion, chronic nephritis is not a disease, but a group of diseases consisting of multiple kidney diseases.