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</html><description>The signs and symptoms of a concussion can be subtle and may not appear immediately. Symptoms can last for days, weeks or longer. The two most common symptoms are confusion and amnesia (loss of memory). The amnesia, which may or may not be preceded by a loss of consciousness, almost always involves the loss of memory of the impact that caused the concussion.</description><thumbnail_url>http://ehealth.cooperhealth.org/wp-content/uploads/2010/07/2007_12_Signs_Symptoms_Concussion.jpg</thumbnail_url></oembed>
