A brain injury is defined as an alteration in brain function caused by an external force such as a blow, collision or jolt.
Concussion may be caused by a direct blow or jolt. For example, a collision during sport or a road traffic accident.
A head injury is any sort of injury to your brain, skull, or scalp. It can range in severity from a bump or bruise to a major skull fracture requiring surgery.
Post-concussion syndrome is an umbrella term for a cluster of difficulties that are present three months or more after an injury.