We’re all likely to have bumped our heads at some point in our lives. Some of us will have experienced whiplash - and if you play a contact sport, your chances of experiencing concussion increase significantly. But do we really understand what’s happening inside our brains when a concussion occurs? Dr Richard Sylvester, consultant neurologist at the Institute of Sport Exercise & Health, part of HCA Healthcare UK, joins Anna, along with former England rugby player, Kyran Bracken.