Korsakoff’s syndrome is a cluster of symptoms characterized by proximate memory impairment, fictionalization, and disorientation, and is primarily seen in patients with dementia. Clinical manifestations of Korsakoff’s syndrome: the first one is proximate memory impairment, patients can forget about recent events, for example, patients often forget what they ate in the morning, or what they said before, but patients tend to have a very deep memory of things that happened several decades ago, and will describe or recall them over and over again. The second, fictionalization, is caused by the patient’s impaired memory. The patient tends to treat situations dreamed up in his or her dreams as if they were real, or he or she may take what Zhang San said as if it were what Li Si said. Thirdly, disorientation, the patient shows abnormal judgment of time, place and people, such as not being able to distinguish between morning and afternoon, or not remembering the way home, and no longer recognizing people they used to know.