Short: Most symptoms from a mild concussion can abate in 24 hours. In a more severe concussion, one can have stmpyoms of headaches for several weeks.
Answered 3/26/2013
5.7k views
Variable: Concussion symptoms can last from hours, to days to a year. You should not do more than mild exercise until yoiur headaches cease.
Answered 4/20/2015
2.9k views
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