WHAT IS A CONCUSSION? A concussion is a type of brain injury. It occurs when the brain moves quickly enough to interrupt its function. Most concussions result in full recovery, but some can lead to more severe injuries if not recognized and treated properly. The source of the injury is not always clear. It can come from a blow to the head or even from a blow to the body. It can come from one big hit or from several smaller ones. You may not always be aware that you are concus