Damage to the angular gyrus is mainly due to lesions of the parietal and temporal gyrus of the main hemisphere, with occlusion of the posterior parietal or angular gyrus artery being common. It can also be seen in brain tumors, traumatic brain injury, brain atrophy, alcoholism, carbon monoxide poisoning, various psychiatric disorders, and hypnotic states. Such as cerebral arteriosclerosis, stroke, cerebrovascular malformation. It can also be seen in brain tumor, traumatic brain injury, brain atrophy, alcohol poisoning, carbon monoxide poisoning, various psychiatric disorders, hypnotic state, etc. Among them, the etiology of traumatic brain injury is as follows. 1.Sudden accelerated head movement can cause brain tissue damage as well as slamming the head. 2, rapid impact of the head on a hard object that cannot be moved or sudden deceleration movement is also a common cause of traumatic brain injury. 3, the impacted side or the opposite direction of the brain tissue and hard and raised skull collision is extremely vulnerable to injury. Acceleration-deceleration injuries are sometimes called contralateral impact injuries.