You are walking and listening to some really cool music and then “Thud”. It seems like your head just hit something very hard, and a sharp pain appears, it seems like there are a few stars floating in front of your eyes. Why do you feel pain and how does the brain react to the body? Let’s find out with Specialist Doctor I Dao Duy Khoa, Head of the Cerebrovascular Disease Unit, Vinmec Central Park International General Hospital how the brain and body react when pain occurs.