A concussion is a brain injury that occurs after physical trauma. A person may suffer a concussion after experiencing a blow to the head, or another physical hit to the body that causes the head to move quickly. The concussion itself is defined by the rapid movement of the brain inside the skull, causing it to move and twist. This results in a number of chemical changes that damage brain cells and cause damage.
Concussions can result in short-term and long-term problems. In most cases, the effects of a concussion will last hours or days, but in more serious cases can result in serious medical problems. This condition is described by medical professions as a form of mild traumatic brain injury (or a TBI), as the symptoms will usually not be life-threatening. Short-term effects include confusion and tiredness, and these effects will usually occur quite quickly after a person experiences head trauma.