A concussion, from the Latin word concussio, is a frequent injury among football players. Concussions occur when the head is subject to a large impact force, resulting in a minor brain injury.  There has been a growing concern about concussions since the early 1900s.  In 1906, a Harvard student athlete died from a head injury and the team doctors released a report titled "The Physical Aspect of American Football" in the Boston Medical and Surgical Journal describing the type, severity, and number of injuries the team sustained in the 1905 season.[5]