It is due to the sudden release of adrenalin, which causes your heart to pump faster and blood rushes all over. Your cheeks have thinner skin than other areas of your body and hence turn red quicker and are more noticeable.Why do your cheeks turn red when you blush? The blood rushes to the skin on your face.Why do your cheeks turn red when you blush? Because you have a lot of blood vessels in your butt. some chemicals in your body. In short It is because your blood is rushing to your face.