Dementia is a term for a range of illnesses. The most common type is Alzheimer`s disease, in which brain cells deteriorate through the build up of protein. Vascular dementia is the second most common type of dementia and is caused by problems in the supply of blood to brain cells. About 75% of people who are diagnosed with dementia will have either Alzheimer`s or vascular dementia, or a combination of the two. There are other forms of dementia which are less common. They include dementia with Lewy bodies, fronto-temporal dementias (including Pick`s disease), Huntingdon`s disease, alcohol-related dementias, and HIV/AIDS-related dementia.

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