Symptoms of TBI

Woman with headache
Symptoms of a TBI can be mild, moderate, or severe, depending on the extent of the damage to the brain.

Symptoms of mild TBI (mTBI) may remain conscious or may experience a loss of consciousness for a few seconds or minutes.

Other symptoms of mTBI:


  • Difficulty thinking clearly
  • Difficulty concentrating
  • Difficulty remembering new information
  • Difficulty in focusing


  • Headache
  • Blurry vision/tired red eyes
  • Dizziness
  • Light/noise sensitivity
  • Balance problems
  • Feeling tired/lethargic
  • Lightheadedness
  • Ringing in the ears
  • Bad taste in the mouth


  • Irritability
  • Sadness
  • Nervousness
  • Anxiety
  • Confusion


  • Sleeping more/less than usual
  • Trouble falling asleep

A person with a moderate or severe TBI may show these same symptoms as above, but may also have a headache that gets worse or does not go away, repeated vomiting or nausea, convulsions or seizures, an inability to awaken from sleep, dilation of one or both pupils of the eyes, slurred speech, weakness or numbness in the extremities, loss of coordination, and increased confusion, restlessness, or agitation.