Playing contact sports such a football or boxing, can not only cause damage in present time, but in the future also. A lot of football players, after they have stopped playing, will start to have symptoms of chronic traumatic encephalopathy or Alzheimer's disease which mean there is long term damage in playing physical contact sports (“Do Sports Concussions Really Cause Chronic Traumatic Encephalopathy”). Also, returning back to a sport that the player was playing to soon can cause higher risks of damaging the brain