Plural of concussion: injuries to the brain caused by a hard blow or impact that can cause dizziness, confusion, or memory problems.
From Latin 'concussus' (past participle of 'concutere' meaning 'to shake together'), entered English medical terminology in the 1600s as doctors needed precise terms for head injuries.
Concussions remained mysteriously invisible to medicine for centuries—doctors couldn't see brain injuries under microscopes—yet the 2010s suddenly recognized them as an epidemic in sports, revealing how invisible injuries were simply ignored until technology and lawsuits caught up.
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