What does it mean when you have a dull ringing in your ears after hitting head?

May be concussion sx: Possible concussion sxs: + or – loss of consciousness, headache / pressure, can't recall event, dizziness, v coordination, ringing in ears, confusion, slurred speech, nausea / vomiting & fatigue. For concussion seek medical care. Seek urgent treatment for loss of consciousness, on-going confusion, seizures, unequal pupils, recurrent vomiting or change in level of consciousness. Seek medical eval.