What Is It?
A concussion is a short-term disturbance in brain function caused by a head injury. A concussion often causes:
Confusion, headache or dizziness
Loss of consciousness lasting less than 30 minutes or no loss of consciousness at all
Loss of memory (amnesia) lasting less than 24 hours
Most head injuries happen during motor vehicle accidents, falls, sports and assaults. Alcohol and drug use can be major contributing factors.