A concussion is a brain injury caused by a bump or blow to the head that can change the way your brain normally works. Even what seems to be a mild bump or blow to the head can be serious. As many as 3.8 million sports- and recreation-related concussions are estimated to occur in the United States each year.
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A concussion is a brain injury caused by a bump or blow to the head that can change the way your brain normally works. Even what seems to be a mild bump or blow to the head can be serious. As many as 3.8 million sports- and recreation-related concussions are estimated to occur in the United States each year.