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Dementia is an organic brain disease, that is permanent, affecting the brain substance, and Alzheimer's Disease is a type of dementia.
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Dementia is a state of being, you can have dementia many ways, including but not limited to, getting hit on the head, being drunk, lack of oxygen, emotions, just waking up and so on.
Alzheimer's is a disease and one of its symptoms is dementia.
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Copyright © 2017 HubPages Inc. and respective owners.