Alzheimer's disease is a progressive disorder that causes brain cells to waste away (degenerate) and die. It's the most common cause of dementia — a continuous decline in thinking, behavioral and social skills that disrupts a person's ability to function independently.
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Dementia: A general term for loss of memory, language, problem-solving and other thinking abilities that are severe enough to interfere with daily life. Alzheimer's is the most common cause of dementia.
Neurodegeneration: The progressive loss of structure or function of neurons, including death of neurons. This process is central to Alzheimer’s disease.
Amyloid plaques: Clumps of protein fragments that accumulate between nerve cells in brains affected by Alzheimer’s disease.