Concussion symptoms may be immediately obvious or present gradually over a few hours or days. These symptoms may be present for days, several weeks, or even longer, depending on the severity of the trauma. Common concussion symptoms include:
Pressure or severe pain in the head
Amnesia concerning the event sourcing the injury
Nausea and vomiting
Appearing to be dazed or confused
Delayed response to questions or slurred speech
Ringing in the ears
Loss of consciousness