OverviewA concussion may result when the head strikes against an object or is struck by an object. Concussions may produce unconsciousness or bleeding in or around the brain.
Update Date 1/15/2014
Updated by: Jacob L. Heller, MD, MHA, Emergency Medicine, Virginia Mason Medical Center, Seattle, Washington. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.