a positive declaration intended to give confidence: He received assurances of support for the project. 2. promise or pledge; guaranty; surety: He gave his assurance that the job would be done. 3. full confidence; freedom from doubt; certainty: to act in the assurance of success.
Summary. Traumatic brain injury (TBI) happens when a bump, blow, jolt, or other head injury causes damage to the brain. Every year, millions of people in the U.S. suffer brain injuries. More than half are bad enough that people must go to the hospital. The worst injuries can lead to permanent brain damage or death.
This leads to a concussion or closed brain injury that can cause mild or serious symptoms. A concussion is defined as a blow to the head that results in disturbance of cerebral function. Concussions are the most common type of traumatic brain injury and can, in more severe injuries, cause permanent brain damage.his leads to a concussion or closed brain injury that can cause mild or serious symptoms. A concussion is defined as a blow to the head that results in disturbance of cerebral function. Concussions are the most common type of traumatic brain injury and can, in more severe injuries, cause permanent brain damage.