This page was reviewed or revised on Tuesday, February 21, 2017 11:31 AM
A concussion is a brain injury that alters the way your brain works.
Usually the effects are temporary but can include:
Concussions can happen to anyone, at any age, at any time.
Usually concussions are caused by a blow to the head but can also occur when the head and upper body are violently shaken. Children and youth have a higher risk from the harmful effects of a concussion.
Concussions are an "invisible" injury and that is why some people have concussions and don't realize it. Concussion injuries needs time and rest to heal properly. Most are mild, and people usually recover fully.
If you suspect someone has a concussion, seek medical help.