Dementia is not a single disease, but a combination of symptoms. This group of symptoms are mainly cognitive dysfunctions such as memory, time and space orientation, judgment, calculation, abstract thinking, memory, and language. The severity of these symptoms is sufficient to affect their interpersonal relationships and work ability. At the same time, symptoms such as interfering behavior and emotional state, personality changes, delusions or hallucinations may appear. More than 90% of the cases will have psycho-behavioral symptoms during the course of dementia and increase the physical, psychological, social and economic burdens of caregivers, as well as increase social costs.
The various causes include Alzheimer’s disease, frontotemporal dementia, vascular dementia, Lewy body dementia, Parkinson’s disease, and Huntington’s disease, alcoholic dementia, dementia caused by Multiple Sclerosis, dementia caused by Down’s Syndrome, dementia caused by HIV/AIDS , the most of which is Alzheimer’s disease.