Answer:
concussion
firearms
Traumatic Brain Injury (also know as TBI) occurs when a person experiences blunt force trauma to the head. This could occur secondary to an accident (i.e. motor vehicle accident) or a fall. This could also occur from a strike to the head, either intentionally or unintentionally (i.e. altercation, or sports related head injury). The TBI occurs when the brain is jostled within the "shell" of the cranium, or bone that houses the brain. This jostling can injure the brain, perhaps causing bleeding or swelling. The injury can range from minor to extremely serious, even causing death. Patients that experience even a minor TBI can have lifelong affects, depending on the areas of the brain impacted and the overall seriousness of the injury.