The main causes of brain amnesia are the following: i. Intracranial infections, such as autoimmune encephalitis, whose foci affect the temporal lobe, medial temporal lobe or hippocampus, and patients may experience transient amnesia and memory impairment. Because the temporal lobe hippocampus is associated with memory and emotional activity, the symptoms can be relieved after administration of immunosuppressive drugs, gammaglobulin or hormone therapy. Second, cerebral amnesia is seen in patients with massive cerebral hemorrhage caused by severe craniocerebral trauma. If the patient is in a coma, as the hematoma is absorbed, the patient will have transient amnesia after regaining consciousness. Third, for example, cerebral lobe, frontal lobe, and temporal lobe infarction can also cause memory loss and transient amnesia, because the frontal and temporal lobes are related to memory. Fourth, concussions caused after traumatic brain injury can also cause transient amnesia.