Cases of dementia are increasing due to longer life expectancy of the world population. Physicians should be able to recognize common dementia syndromes. After excluding reversible causes of dementia, there are four common dementia syndromes, which are Alzheimer’s disease, vascular dementia, dementia with Lewy body, and frontotemporal dementia. The key points of clinical differences of these dementia syndromes are summarized in this article.
Key words: Alzheimer’s disease, vascular dementia, dementia with Lewy body, frontotemporal dementia, Parkinson’s disease.