The decrease in blood pressure after exercise is mainly due to the increase in effective circulating blood volume and vasodilatation, peripheral resistance is reduced, the blood mainly flows to the limbs, skin, etc., and the blood in the heart is reduced, which is a normal phenomenon. 1. Increase in effective circulating blood volume: During exercise, sweating, increased metabolism, large loss of water and energy, and a decrease in effective circulating volume, leading to a decrease in blood pressure. 2. Expansion of blood vessels, lower peripheral resistance: exercise will increase blood circulation, limbs, skin and other peripheral blood demand greatly increased, making blood vessels show expansion state to help blood supply, so in the expansion of blood vessels, peripheral resistance is also lowered, resulting in lower blood pressure. Reduced blood pressure after exercise is a physiological phenomenon, i.e., a healthy state, no need to worry too much, if it is obvious to feel panic palpitations, persistent sweating, chest pain and other undesirable symptoms, need to consult a doctor as soon as possible, a clear diagnosis, timely treatment, and be vigilant about the adverse consequences.