Interacting Kidneys and Blood Pressure Hypertension can cause hypertensive nephropathy, which shows that the kidneys are organs susceptible to hypertension. The kidneys are rich in blood flow and have a very close relationship with blood pressure, so I would like to explain the relationship between the two. About 80% of hypertensive patients have “essential hypertension”, and 30-40% of them have “salt-sensitive hypertension” which can be controlled by reducing salt intake. When the amount of salt in the blood increases, the water in the cells will flow into the blood, resulting in an increase in blood volume and a rise in blood pressure. The kidneys will excrete a large amount of salt because of the increase in blood volume and the rise in blood pressure, resulting in a decrease in body fluids and a fall in blood pressure. On the contrary, when the salt in the blood decreases and the blood pressure falls, the kidneys will relatively decrease the amount of salt excretion to increase the blood volume so that the blood pressure rises. Like this, the kidneys serve the important task of regulating blood pressure. Therefore, the state of high blood pressure will increase the burden of the kidneys and impair the kidney function. On the other hand, when kidney function is impaired for some reasons, abnormal blood pressure may also occur. This type of hypertension is called “renal hypertension”. Renal hypertension is caused by long-term kidney disease and deterioration of kidney function. The next chapter will explain how to treat it. Renal hypertension caused by kidney disease can be divided into two main categories. First, renal hypertension is caused by acute glomerulonephritis and chronic glomerulonephritis. It is believed that this is due to a decrease in the filtration capacity of the glomeruli, which reduces the ability to filter salt, causing salt and water to accumulate in the body, which in turn leads to the development of hypertension. Therefore, the pathogenesis and treatment are similar to that of salt-sensitive hypertension. Another type of renal hypertension is called “renal vascular hypertension”, which is caused by reduced blood flow (perfusion) within the kidneys due to narrowing of the renal arteries. In order to improve the situation of insufficient blood flow, the kidneys will secrete a large amount of renin, which can increase the blood pressure, to make the blood pressure rise and ensure the blood supply to the kidneys. Mechanisms of hypertension caused by kidney disease There are two types of hypertension caused by kidney disease