The causes of memory loss in the elderly are Alzheimer’s disease, stroke, and physiological amnesia, as follows: First, Alzheimer’s disease: the most common is senile dementia. Alzheimer’s disease is a neurodegenerative disease mainly seen in elderly people over 60 years old, and its main manifestation is the decline of near memory, dysfunction in calculation, judgment, language function, and visual space, etc. Patients will also be accompanied by a decline in social function and daily living ability. Second, stroke: stroke is the most common cause of vascular dementia, mostly seen in middle-aged and elderly people with hypertension, diabetes and hyperlipidemia, so it is important to control risk factors to prevent stroke. Third, physiological amnesia: Older people gradually lose their memory as they age, but their daily social functions and daily living skills are better maintained. This is a physiological phenomenon and does not require intervention.