Most people with Alzheimer’s disease are unable to take care of themselves before they die, and need to be taken care of by others 24 hours a day. The patient does not know his son, spouse or even who he is, and does not know where he is. Third, there are a variety of behavioral abnormalities, the most common is the lifelong silence, the patient can not say a word for months. Fourth, most have complications such as lung infections, pressure sores, and thrombosis.