A recent injury televised nationally to millions of fans has put the spotlight on concussions as a form of traumatic brain injury, or TBI. When Miami Dolphins quarterback Tua Tagovailoa was injured on the field, many people began to ask: how serious is a concussion? Is it something to worry about? Can it cause long-term disability or injury? The answers to these questions may surprise you, particularly if you have been involved in a slip-and-fall or car accident that involved a mild head injury.