Proteinuria due to hypertension is a kidney injury that occurs due to unstable blood pressure control over a long period of time. The earliest manifestation of kidney injury is an increase in trace proteinuria in the urine, because the main function of the kidney is to filter water and keep protein and fat and sugar metabolism smooth. If the kidney function is damaged, it will lead to the leakage of small molecules of protein due to the reduced filtration membrane action. At this time, foamy urine is often not visible to the naked eye or blood tests are normal for creatinine, but microprotein urine tests can detect the problem. Once a patient with hypertension has proteinuria, it is important to control blood pressure properly. The presence of proteinuria in hypertensive patients indicates that the previous blood pressure is not well controlled, and it is important to regularly take enalapril or captopril and other antihypertensive drugs, which can slow down the progression of nephropathy and proteinuria while lowering blood pressure.