Let’s talk about cognitive dysfunction in the elderly. Cognition is the ability of the human brain to learn to acquire and apply knowledge by receiving an external stimulus and transforming it into its own mental activity, which mainly includes several domains, such as memory, language ability, visual-spatial ability, executive function, orientation, and thinking and judging ability. If one or more cognitive domains are impaired in the cognitive domain, it is called cognitive dysfunction, and if two or more cognitive domains are impaired and accompanied by a decrease in daily living ability, it progresses to dementia. In the stage of mild cognitive dysfunction, there is mainly mild memory loss, a slight decrease in the ability to learn and retain new knowledge, and mild impairment in other cognitive domains, including attention, executive ability, and visuospatial ability. In this case, there is no impact on the ability to perform daily living with close follow-up.