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Injury is an insult to the body with the resultant adverse effect. This can be brought up by physical insult, chemical/toxic injury or thermal injury.

It is the most disabling condition that is associated with great mortality if not treated optimally. It is invariably followed by permanent disabilities.

It is any episode of trauma to the head (brain). Mortality is high.

Trauma may occur as a result of motor vehicle crash, fights, fall, gunshot, sports, animal bites etc. and is associated with head, musculoskeletal, lacerations, visceral and neurovascular injuries.