For a long time, concussions were considered insignificant injuries that people quickly recover from. However, we now know that concussions are significant injuries that can have long-lasting effects. Modern testing has documented their impact on cognitive function for months to years after injury, and repeated concussions have been linked to the development of neurodegenerative diseases. Much of the problem stems from the fact that the symptoms of these "invisible" injuries are not always easily and immediately recognized. Tune in as the PSI team describes how concussions occur, their impact, and the links between concussions and degenerative diseases.