Alzheimer’s disease, also known as Alzheimer’s disease, has a variable survival period after diagnosis, often ranging from 3-10 years or more, depending on when the disease is detected. If the disease is detected early and the diagnosis and treatment are appropriate, the survival period is relatively long, some of them can reach more than 10 years. Severe Alzheimer’s disease is mainly manifested by the severe loss of the patient’s ability to live, and the patient is unable to take care of himself or herself, sometimes even unable to eat by himself or herself, and needs to be fed by others, or even needs to be fed through a stomach tube or nasal feeding. In addition, some patients have lost some of their own mobility and need to be bedridden for a long time, which can lead to complications such as lung infections and bed sores. Therefore, the survival period of these patients with severe dementia varies according to the patient’s general condition, and there is also a clear relationship with the caregiver’s level of care, which varies from person to person.