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Home > About Alzheimer's and Dementia > Understanding Alzheimer's Disease

Understanding Dementia

Dementia is the basic term for ‘loss of memory’ and other mental abilities severe enough to interfere with daily living. It is caused by physical changes in the brain. While, Alzheimer’s disease is the most common type of dementia (accounting for 50 to 70 percent of cases), below is a list of other types of dementias:

Types of Dementias

 Creutzfeldt-Jakob Disease (CJD)

A very rare and incurable degenerative neurological disorder (brain disease) that is fatal.
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 Dementia with Lewy Bodies

A progressive degenerative disease or syndrome of the brain, which sometimes has the same similarities as Parkinson's Disease and Alzheimer's Disease.
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 Frontotemporal Dementia

An umbrella term for a diverse group of uncommon disorders that primarily affect the frontal and temporal lobes of the brain.
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 Huntington's Disease

A genetic neurological disorder characterized after onset by uncoordinated, jerky body movements and a decline in some mental abilities.
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 Normal Pressure Hydrocephalus

Normal pressure hydrocephalus (NPH) is a form of hydrocephalus, also known as "water on the brain," which means there is too much fluid pressing on the brain.
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 Parkinson's Disease

A degenerative disease of the brain (central nervous system) that often impairs motor skills, speech, and other functions.
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 Vascular Dementia

Widely considered the second most common type of dementia. It develops when impaired blood flow to parts of the brain deprives cells of food and oxygen.
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 Wernicke-Korsakoff Syndrome

A brain disorder involving loss of specific brain functions caused by a thiamine deficiency.
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This project was supported, in part, by a grant, number 90AZ2791, from the Administration on Aging, Department of Health and Human Services, Washington, D.C. 20201. Grantees undertaking projects under government sponsorship are encouraged to express freely their findings and conclusions. Points of view or opinions do not, therefore, necessarily represent official Administration on Aging policy.