Intracranial injuries caused by external forces include concussion, diffuse axonal injury, etc. Whether intracranial injuries caused by external forces will affect intelligence depends on the specific condition. 1. Concussion: Usually there is a transient brain dysfunction such as retrograde amnesia and disorientation after the injury, but usually it can be recovered after a period of time, and usually there is no intellectual disability left. 2. Diffuse axonal injury (1) Light diffuse axonal injury: memory loss and retrograde amnesia may occur, but there is no limb movement disorder. After systematic treatment, there is usually no intellectual disability left. (2) Medium diffuse axonal injury: Coma may occur for several days to weeks after injury, often accompanied by skull base fracture, occasionally with brainstem signs and decortication, accompanied by obvious memory loss, retrograde amnesia, mild limb movement disorders, and may be left with mental abnormality. (3) Heavy diffuse axonal injury: the most severe type, with coma for several weeks or longer after the injury, marked brainstem signs, decortication, and deafferentation, usually with residual mental retardation. In addition to the above disorders, trauma may cause cerebral contusion, intracranial hemorrhage and many other types of injuries. In the event of intracranial injuries, it is advisable to seek prompt medical attention.