More than half of the patients have a past history of “acute pyelonephritis”, which is actually not acute pyelonephritis but the first symptom of chronic pyelonephritis, followed by malaise, intermittent low-grade fever, anorexia, lumbago, lumbago, mild discomfort in the quadriplegia or abdomen, and other symptoms of lower urinary tract irritation such as urinary frequency, urinary urgency, and pain. The symptoms are accompanied by lower urinary tract irritation such as urinary frequency, urinary urgency, urinary pain, etc. Acute attacks are also seen from time to time, while the course of typical chronic lesions is more insidious. Benign small artery nephrosclerosis is caused by long-term uncontrolled benign hypertension, the higher the blood pressure and the longer it lasts, the more severe the lesion. The arterial lesions are mainly glassy lesions in the walls of the small arteries entering the bulb, and intimal thickening in the walls of the interlobular and arcuate arteries, which cause ischemic renal parenchymal damage. The higher the blood pressure and the longer it lasts, the more severe the lesion. Arterial lesions are mainly glassy lesions in the walls of small arteries entering the bulb. In summary, the necessary conditions for diagnosis are: ① primary hypertension. (2) Persistent hypertension (generally >20.0/13.3kPa (150/100mmHg)) for more than 5 years before the appearance of proteinuria. ③There was persistent proteinuria (generally mild to moderate) with few microscopic fractions. ④There is retinal arteriosclerosis or atherosclerotic retinal changes. ⑤Excluding various primary renal diseases. ⑥Excluding other secondary renal diseases.