When brain pressure rises, so does blood pressure, a physiological regulatory mechanism that naturally exists in the human body. Under normal conditions, the brain is a tissue that is very dependent on blood, and all nutrient supply and oxygen supply comes from blood, so maintaining normal blood pressure will ensure adequate pressure and blood supply to the brain. However, if an increase in intracerebral pressure occurs, there will be a decrease in blood supply to the brain at normal blood pressure, which is caused by insufficient pressure. In order to balance the pressure gradient, the body will have a reflex mechanism and the blood pressure will then rise in order to ensure adequate blood supply to the brain, when the blood pressure will be significantly higher than normal. When patients have symptoms of high cranial pressure, they can be treated by lowering the cranial pressure first, and when the cranial pressure drops, the blood pressure will also drop, and there is no need to use blood pressure-lowering drugs specifically.