Concussion : This is basically caused by the brain hitting the skull or the skull hitting it due to injury. The brain sits in fluid. Anyone who is knocked unconscious has a conclusion, that's easy. Lots of sports injury with schools ansd states making definition. If person is hit in the head and sees"stars". They have a concussion and should be evaluated. Evidence shows even small concussions are dangerous.
Answered 6/23/2014
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