CNN Sanjay Gupta MD November 17, 2013 12:50:00
>> 13-year-old eric sweeney is describing a concussion he suffered a few weeks ago. >> didnt hurt or anything, it just shocked -- like, it felt all fuzzy in the back of my head. >> reporter: on his team sideline, no one saw the play. and despite that fuzzy feeling, eric was raring to go. >> he came out after that play. and he was ready to go back in. >> but he was stopped short, by this. it is supposed to flash yellow after a moderate inmpact to the head and red after a severe one. when eric cam...
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