According to the 2019 Global Dementia Report of the Dementia Association International (ADI), it is estimated that there are more than 50 million people with dementia in the world, and it is expected to grow to 152 million people by 2050. One person develops dementia every three seconds; dementia-related costs are currently estimated at US$ 1 trillion per year and are expected to double by 2030. In the past, it was generally believed that there was no cure for dementia, but in recent years there have been many advances in the treatment of dementia. It is still possible for patients to improve symptoms or delay deterioration through treatment, and improve the quality of life of patients and their families in the future. Therefore, seeking medical attention early is very important.