In Alzheimer’s patients, life expectancy is usually about 10-20 years. Alzheimer’s disease refers to Alzheimer’s disease, which is a degenerative disease of the nervous system. Once it occurs, the course of the disease generally progresses and worsens, with early manifestations mainly in the form of impairment of near memory, not remembering things that have just happened, with fair preservation of distant memory. As the disease progresses, distant memory is also gradually impaired, and personality and behavioral changes occur, with significant mental impairment in later stages. Patients often have irritability, aggressive tendencies, and obvious disorientation to time, place, and people. In the late stages, they are bedridden, incontinent, lose the ability to communicate with the outside world, and require family care. Patients die mostly due to various complications, such as pulmonary infections, decubitus ulcers, urinary tract infections, electrolyte disorders, and hypoproteinemia, etc. Most patients die from infections as well as multiple organ failure.