Learn how to prevent and deal with concussions in young athletes. By Krisha McCoy, MS Medically reviewed by Cynthia Haines, MD A concussion, particularly common in kids who participate in sports, is a brain injury that is caused by a blow to the head. Even when they seem mild, concussions can be serious. It is therefore important to know how to recognize the signs of a concussion and take the necessary steps to seek treatment ...