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Does someone need to be “knocked out” for it to be a concussion?

No! While being “knocked out” or losing consciousness is the most obvious, and scariest, sign of a concussion, only 10% of concussions result in loss of consciousness, according to a 2010 Pediatrics review article.
 
Other symptoms of concussion (in addition to loss of consciousness) include:
 
Confusion, Amnesia, Disorientation, Delayed Verbal/Motor Response, Inability to Focus, Headache, Problems with Balance, Dizziness, Visual Disturbances, Nausea/Vomiting, Mood Swings, and Disruptions in Sleep.
 
If you have any of these symptoms after experiencing a hit, you should seek medical attention immediately.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.