Sudden memory loss is considered to be caused by neurological disorders of the brain, most often considered to be transient ischemic attacks. If the lesion is in the temporal lobe, frontal lobe or hippocampus, it will easily lead to memory loss, but the memory will be recovered soon after a period of time, which is considered to be transient ischemic attack. If the patient’s sudden memory loss does not recover for a long time, it is considered to be caused by cerebral infarction, and it is necessary to consult the hospital in time to do magnetic resonance brain function imaging examination to clarify. Sudden amnesia should be analyzed in combination with other accompanying symptoms, such as many epilepsy patients, when the seizure will appear loss of consciousness, the patient will not have any memory of what happened during the seizure when he/she is conscious, and an electroencephalogram can be done to clarify the situation.