Alzheimer's disease overview

	Alzheimer's disease Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Alzheimer's disease is the most common cause of dementia among older people. Dementia is a loss of thinking, remembering, and reasoning skills that interferes with a person's daily life and activities. Other causes of dementia include blood vessel disease in the brain (called vascular dementia), Parkinson's disease, frontotemporal dementia, and Lewy body dementia.