If the recent old forgetfulness need to consider the following diseases may be: First, dementia, the scientific name of Alzheimer’s disease, is a neurodegenerative disease, the incidence of older people over the age of 60 years old will increase year by year, the early stage of the disease to the near memory impairment as the main manifestation of the disease progresses with the disease later there will be far memory impairment, as well as mental disorders, personality and behavioral changes, the early emergence of near memory impairment to be timely diagnosis, after diagnosis and drug intervention therapy can delay the progress of the disease to prolong the survival of patients with social function. When the disease is diagnosed, drug intervention therapy can slow down the progress of the disease and prolong the survival time of patients with social function. Second, acute cerebrovascular disease, cerebral hemorrhage, cerebral infarction, if the involvement of the temporal lobe, hippocampus, amygdala and other areas in charge of memory will cause amnesia, improve the cranial CT or magnetic resonance examination can rule out whether there is cerebrovascular disease, if found in a timely hospitalization. Third, encephalitis, in young people with fever, headache and other inflammatory manifestations and memory loss, it is necessary to suspect whether there is viral encephalitis or autoimmune encephalitis, improve the cranial magnetic resonance, lumbar puncture, cerebrospinal fluid routines, biochemical routines, and various immune indexes can help to confirm the examination. Fourth, other functional diseases, anxiety, depression, neurosis can lead to patients with reduced learning efficiency, reduced work capacity, not because of memory impairment but its attention can not be focused on the result, to give anti-anxiety, antidepressant treatment can usually be improved.