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it can cause brain damage it can happen any time.

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when you hit your head really hard.

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concussions are when you get hit hard and a brain injury

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brain injury

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three stages

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a concussion is when you hit your head very hard and you can get a very bad headache or sometimes you don't remember things

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For most people when you get a concussion everything looks like a shade of green even people. It gets better after a while but you have headaches trouble seeing and everything is green. This happenes when you hit your head on something really fast or hard. Like hockey when you go into the boards head first...

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I think it is when someone hits their head super hard but you also don"t always half to hit your head >_<

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it happens when you hit your head really hard or you could get a whiplash

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A brain injury caused by a blow to the head or a violent shaking of the head and body.
Symptoms may include headache, confusion, lack of coordination, memory loss, nausea, vomiting, dizziness, ringing in the ears, sleepiness, and excessive fatigue.

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i concussion is 3 stages and when you hit your head on something hard sometimes when you hit your head and i does brain damage

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a concussion is something when some way you hurt your head really hard