The phrase "concussion symptoms" refers to the signs or physical and mental changes that someone may experience after hitting their head very hard. Full definition
Of those, 50 did not immediately report concussion symptoms. (sciencedaily.com)
You may also want to return to this list of symptoms throughout the recovery time to see if your child is experiencing a return or increase of concussion symptoms. (verywellfamily.com)
Your child may experience some strange behavior or concussion symptoms in the hours immediately after receiving a blow to the head. (verywellfamily.com)