With the socio-economic development and improvement of living standards, the average life expectancy of citizens has increased significantly and the population of elderly people is rapidly increasing. According to the World Health Organization, a country with an elderly population (over 65 years old) accounting for more than 10% of the total population indicates that the country has entered an aging society. The increase in the elderly population is associated with a significant increase in diseases, including Alzheimer’s disease, which is one of the diseases that seriously affect the health of the elderly. The prevalence of Alzheimer’s disease is between 5-8% and constitutes a major health and social problem in many developed and developing countries. As early as 1974 and 1977, the National Institute of Aging and the Institute of Medicine of the United Kingdom have listed Alzheimer’s disease as a key research project in geriatric medicine, and invested a lot of manpower and material resources, and made significant progress. Alzheimer’s disease is a neuropsychiatric disease that occurs in old age with chronic progressive mental decline as the main manifestation. Early symptoms are memory loss, emotional changes, decreased interest, paranoia and altered circadian rhythm of sleep; further development of impairment of both distant and near memory, impaired calculation, orientation and judgment, or other psychiatric symptoms, personality changes and loss of self-control. At present, the cause of Alzheimer’s disease is unclear, and the onset is often insidious and unnoticed. Therefore, it is very important to correctly recognize the early symptoms of dementia, so that patients can receive timely treatment and slow down the progress. What are the early symptoms of Alzheimer’s disease? 1. Changes in emotion: The most prominent clinical manifestation in the early stage is the change in senior emotional activity, i.e., weakened affection, not as caring and considerate to relatives as before, and further development will become emotionally flat and do not care about anyone. Some patients also show emotional instability, emotional fragility and tearfulness, depression and sadness, anxiety over trivial matters, fear of fear, etc. 2, memory decline: early memory impairment in dementia is very prominent, the patient is easy to forget things, lose three or four, the initial manifestation is the forgetfulness of recent events, such as a few hours ago just eaten food has been unable to recall. In the early stage, the patient can’t remember the name and phone number of an acquaintance, or say the same words or ask the same questions over and over again. It is difficult to communicate verbally because they forget what they said at the beginning of the conversation. 3.Psychological disorder: Some patients have psychological disorder, due to memory loss, they don’t know where they put things and always suspect that someone has stolen his things. 4.Decreased intelligence: Often forget how to organize numbers, forget the password they set for their savings, and forget the amount of their savings. They used to be very familiar with work and technology then suddenly can not do it, such as can not play chess, etc. 5.Diminished interest: often become lazier than before, unwilling to participate in any activities, even the original favorite activities, not enthusiastic about people, unwilling to meet with old friends, loss of initiative. 6.Change in personality: easily angry, suspicious or afraid, very different from the original character, the past very generous, generous people become uncharacteristically excessive frugality, collecting scraps everywhere, some patients compare their simple sketches drawn as famous artists, ready to be treasured. 7. Poor judgment of time and place: one may get lost near one’s home, or forget how to get out of one’s home or how to get home. If an elderly person has one or several of the above-mentioned manifestations, he or she should promptly go to a regular hospital for examination and treatment to avoid delaying the condition and endangering health.