Bumping your head is all too easy, (especially with a ginormous head like mine). From accidentally hitting your head on the cabinet above you, to getting hit by a 250 Lb. linebacker, head trauma is too common. If you hit your head hard enough to cause a headache, there is a good chance that you have sustained a concussion.
Concussions are traumatic brain injuries that can occur from both mild and severe blows to the head. It occurs when your brain is hit violently against the inside of your skull; it is essentially a "brain bruise." Recent research has indicated that even mild concussions can have serious, long-term effects, especially if they are cumulative. A sudden turning movement such as a punch to the side of the face is more likely to cause unconsciousness.
http://theconcussionblog.com/what-is-a-concussion/
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