Why do we blush when experiencing strong emotions? Blood vessels, or more precisely their smallest representatives, the capillaries, have something to do with this blush. In response to strong emotions, our body gives the command to expand the blood vessels. We need it, for instance, in order to run away more quickly, if our emotions arise from fear of a predator. So, this mechanism was put in us by nature at the very beginning of our history. Thus, it's not just our cheeks that turn red, but our whole body☝🏻