Hypertension can cause renal insufficiency. The causes may be ischemia, glomerular injury, tubular function injury and so on. 1. Ischemia: long-term high blood pressure will cause the heart to increase the difficulty of pumping blood, reduce the amount of blood pumped, the amount of blood used for systemic circulation will be reduced, then the amount of blood available to the kidneys will also be reduced, long-term ischemia will cause renal insufficiency. 2. Glomerular injury: long-term high blood pressure will cause glomerular artery sclerosis, glomerular artery sclerosis will lose the normal filtration function, resulting in proteinuria, hematuria and other symptoms, the emergence of a variety of acute and chronic renal lesions, and then develop into renal insufficiency. 3. Renal tubular function damage: long-term hypertension causes ischemia of renal parenchyma, which will cause renal tubular damage, and renal tubular damage will affect the renal reabsorption function, and then form renal insufficiency. Poor control of high blood pressure may not only damage the kidneys, but also damage the heart and brain, so it is necessary to follow the doctor’s instructions to take medication regularly to control blood pressure, to reduce the emergence of complications, once complications occur, it is recommended to go to the hospital in a timely manner.