A concussion occurs when your brain bounces or twists inside your skull or experiences rapid, whiplash-type back and forth movement that causes it to collide with the inside of your skull. This brain movement stretches and damages brain cells and leads to chemical changes in the brain.
http://www.pharmacytechcareers.com/how-a-concussion-happens-%f0%9f%91%8d-shorts-by-pharmacy-tech/
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