A concussion may occur when the head hits an object, or a moving object strikes the head. A concussion is a less severe type of brain injury. It may also be called a traumatic brain injury.

A concussion can affect how the brain works. The amount of brain injury and how long it will last depends on how severe the concussion is. A concussion may lead to headaches, changes in alertness, loss of consciousness, memory loss, and changes in thinking.