Alzheimer’s disease is the most common type of dementia in old age, mainly manifested by progressive memory impairment, other cognitive dysfunction, language impairment, personality and mood changes, etc. The onset of the disease is insidious, with a chronic and progressive course, and the patient’s symptoms are progressively aggravated. Early manifestations: The disease is insidious in its onset and can be easily overlooked or considered as ordinary “forgetfulness” in the early stage, mainly manifesting as memory loss, especially recent memory, losing things, forgetting quickly what was just said and done, often asking the same question repeatedly, doing one thing over and over again, forgetting where to put things, forgetting familiar things or acquaintances’ names, frequently used numbers, telephone numbers, etc. The ability to make judgments decreases and it is difficult to handle complex problems; emotional indifference and social withdrawal; the ability to see space in complex structures becomes poor. In the middle term, memory decline is more pronounced, and in addition to recent memory, there is also a decline in distant memory. Cognitive function is significantly reduced, with decreased comprehension, judgment, and calculation; difficulty in abstract thinking, words that do not make sense or answers that do not make sense. The patient is partially unable to take care of himself/herself, does not think about eating and drinking, and needs help to perform daily activities such as eating, dressing, bathing, and grooming; loss of use and recognition; change in temperament, and social interaction is significantly reduced. Late manifestations: The above symptoms are further aggravated, and the patient is completely unable to take care of himself, requiring complete nursing and living care, with significant neurological dysfunction, dull expression, prolonged bed rest, muscle rigidity, swallowing difficulties, and urinary and fecal incontinence. The prognosis is poor, with patients eventually dying due to complications such as concurrent infections and malnutrition. Alzheimer’s disease does not arise in one or two days, but always starts silently and continues to decline in intelligence. The course of the disease is usually 5 to 12 years, and the early manifestations are mainly memory loss, so families with elderly people should raise awareness of the disease, identify the symptoms of Alzheimer’s disease early, seek medical attention and treatment early, so as to slow down the development of the disease and improve the quality of life.