A concussion is an injury to the brain that commonly occurs in sports. There are an estimated three to four million sport-related concussions that occur in athletes each year. Concussions can occur from a direct blow to the head or a blow to somewhere else on the body that produces a jerking motion of the head. Most concussions do not result in being knocked out or losing consciousness. Mark Halstead, MD, discusses sport-related concussions.
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