A concussion is a type of traumatic brain injury that is caused by a blow to the head or body, a fall, or another injury that jars or shakes the brain inside the skull. Although there may be cuts or bruises on the head or face, there may be no other visible signs of a brain injury.
Posted at 6:19 PM, Nov 08, 2013
and last updated 2013-11-08 18:19:03-05
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