A concussion is a brain injury caused by a blow to the head or body that forces the brain to rock inside the skull. It changes the way the brain functions and can last for days, weeks or longer, but does not often result in permanent damage. However, it's important to recognize the signs and symptoms of one so you can seek proper concussion management. Dr. Jonathan Preszler, specialist in sports neuropsychology, discusses the signs and symptoms of a concussion so you know what to look out for. O