Elderly dementia generally refers to Alzheimer's disease. This disease begins slowly and progressively worsens, with symptoms becoming increasingly severe. In the later stages of dementia, symptoms are numerous, mainly reflected in the following aspects: First, patients may exhibit significant personality changes. For example, a person who was originally gentle may become irritable and prone to aggressive behaviors such as hitting or yelling at others, and may even experience incontinence. Second, a patient's overall cognitive functions completely collapse, with a comprehensive decline in memory, as well as significant impairments in computational abilities, judgment, and comprehension. There are also problems with time orientation, with patients unable to distinguish between day and night. Additionally, patients may experience severe malnutrition, develop bedsores, and suffer from serious complications such as pulmonary infections and urinary tract infections.