The United States had 2.53 million emergency department visits, 288,000 hospitalizations, and 56,800 deaths associated with TBI in 2014. In addition to this number, more TBIs are occurring per year. Aside from sport- and recreation-based concussions, military service members are also at risk of getting TBIs while they are on deployment. While there is no direct method for diagnosing and classifying TBI, it is mainly altered brain structures or functions caused by an external force. Some of the clinical signs that are deemed to be enough for a diagnosis include acute intracranial injury or neuroimaging, neurologic deficits, unconsciousness, amnesia for peritraumatic events, and confusion or other evidence of altered mental status. Different injury severity strata of TBIs include mild, moderate, and severe based on the level of consciousness and the duration of the consciousness and posttraumatic amnesia.