Head Trauma mainly include three conditions: concussion, contusion and Permanent neurological deficit resulting in inability to perform at least 3 activities of daily living as confirmed by a neurological specialist.   Caused by a violent blow to the head, resulting in transient or prolonged unconsciousness with or without impairment of higher mental functions or brainstem functions For example, violent shaking of head, fall from high aptitude Absence of wound A head injury of sufficient force to bruise the brain More severe than brain concussion The bruising of the brain will often involve the surface of the brain and cause an extravasation of blood Usually will cause permanent neurological deficit A wound usually can be seen. Cerebral hemorrhage and cerebral edema are sometimes present.