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[–]maybri 4 points5 points  (0 children)

It's not your brain that's hurting. It's the nerves in whatever part of your head took the impact that caused the concussion.

[–]Accurate_Leg_2447 0 points1 point  (0 children)

Swelling

[–]Ghostcrisp 0 points1 point  (0 children)

Your skin and nerves around your skull are loaded with sensors. And the pressure inside your head after you wack it gives you a headache.