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In simple terms, concussion refers to a traumatic injury to the brain. It majorly results from the effect of a hit to the head with brute force. It, however, can also occur from rapidly moving the head back and forth with force. This tends to cause twisting and bouncing of the brain when done with high frequency and intensity. The effect is chemical changes in the brain which can cause damage in brain cells.

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Source : Can Cannabis Treat Concussions? Athletes Want to Know

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