Dementia is a collection of diseases that have the same or similar presentation. Dementia refers to damage to the brain, which can be caused by different things, that generally affects memory and understanding, to the extent that it creates problems for the person in their day to day lives and is deteriorating. It is a terminal condition.
Alzheimer’s disease is the most common form of dementia, the second most common kind is vascular dementia. Therefore Alzheimer’s is a form of dementia, as is vascular dementia, with dementia being the overall umbrella terms for these conditions. There are many different kinds of dementia and each can have a slightly different presentation, deterioration and life expectancy.