A concussion is an injury to the brain caused by a blow to the head, or by striking the head on another object. It may result in loss of consciousness or confusion, and the effects usually resolve in a few hours or days. Learn what happens during a concussion, how it should be treated, and what preventive steps to take.


Online Medical Reviewer: Louise Akin, RN, BSN
Online Medical Reviewer: Daphne Pierce-Smith, RN, MSN, FNP, CCRC
Last Review Date: 1/13/2009
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