Exertion is also known as exertion, if the original blood pressure is low, after exertion due to a large number of sweating caused by blood volume reduction and peripheral vasodilatation and other reasons, resulting in a lower blood pressure. 1. Decrease in blood volume: after exertion, you tend to sweat more, and if you don’t drink water in time, it will cause the decrease in blood volume, which will lead to the situation of low blood pressure in crude oil and lower blood pressure. 2. Peripheral vasodilatation: when exertion, due to vasodilatation will cause a decrease in peripheral vascular resistance, blood volume decreases, and there is a decrease in peripheral vascular resistance, there will be a decrease in blood pressure. People who have low blood pressure, must pay attention to, avoid excessive force, there is a lot of sweat, must actively supplement water, to avoid the emergence of low blood pressure patients with lower blood pressure, thus dizziness and other symptoms, such as obvious discomfort, it is recommended to go to the hospital in time to see a doctor.