Give it time: Should stabilize and fully heal by 6 weeks, if all that occurred was a "bad concussion", followed by post-concussional symptomatology. However, some head injuries are accompanied by low level brain injury. If symptoms persist beyond 8 weeks, get this checked out.
Answered 8/29/2013
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Weeks to months: After a first concussion it may take several weeks to months for symptoms to resolve.
Answered 4/23/2015
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