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A concussion is any injury to the brain that disrupts normal brain function typically on a temporary basis. Concussions are usually caused by a blow or jolt to the head but may occur from a hit to the body that produces a reflex force to the head.

The symptoms of a concussion range from subtle to obvious and usually happen right after the injury but some may take hours to a few days to develop. Athletes who have had concussions may report feeling normal before their brain has fully recovered. With most concussions, the player is not knocked out or unconscious.