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Alzheimer's Disease and Related Dementias

Dementia is the loss of intellectual functions, such as thinking, remembering and reasoning, of sufficient severity to interfere with a person's daily functioning. It is not a disease in itself, but rather a group of symptoms that may accompany certain diseases or physical conditions. Some of the better known diseases that produce dementia include Alzheimer's disease, vascular dementia, Huntington's disease and Parkinson's disease.