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A concussion is an injury to the brain caused by a blow to the head, or by striking the head on another object. It may result in loss of consciousness or confusion. It may also cause amnesia or loss of memory about the event that related to the concussion as well as a variable amount of time before or after. A history of loss of consciousness, amnesia, or confusion after a blow to the head is diagnostic of this injury. In addition, a neurologic examination, which may include a computed tomography (CT) scan or a magnetic resonance imaging (MRI) scan, reveals normal findings. The effects of a concussion usually resolve completely in a few hours or days.

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