The progression of dementia in the elderly mainly includes the following aspects. The first is the pre-stage of mild cognitive impairment, during which patients show no clinical symptoms. Some may only report slight memory impairment, with a possible slight decline in learning ability and a mild decrease in the capability to learn new things. As the disease progresses to the second stage, the period of mild cognitive impairment occurs, where patients will experience impaired memory, but it is not particularly obvious, and daily life is not affected at all. Then, entering the third stage, some periods of dementia occur, during which patients' memory, executive abilities, computational skills, and judgment are significantly impaired. Patients might even get lost or possibly forget their own names. As the disease further progresses into the later stages of dementia, the elderly may exhibit some psychiatric symptoms. They become delirious, talk to themselves, and may see things that do not exist. Eventually, the elderly may end up bedridden, with complications such as pulmonary infections and bedsores.