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More severe concussions can include: loss of consciousness, nausea or vomiting, seizures, loss of muscle use on one or both sides of the body, unequal pupil size, and repeatedly asking the same question such as, "What happened?" or "Where am I?" For a more severe concussion, do the following: summon emergency medical assistance immediately, have the victim lie down or sit until help arrives, and give first aid for any additional injuries.