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Basics of Alzheimer's Disease and Dementia

Alzheimer’s disease is an irreversible, progressive brain disorder that slowly destroys memory and thinking skills and, eventually, the ability to carry out the simplest tasks. It is the most common cause of dementia in older adults. While dementia is more common as people grow older, it is not a normal part of aging.

Watch a video about how Alzheimer's changes the brain.

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Alzheimer's Disease Fact Sheet

What is Alzheimer’s disease, what causes it, what are the symptoms, and how is it treated? Get answers to these questions and more in this NIA fact sheet.
Animation showing an older man's brain

What Is Alzheimer's Disease?

Learn about Alzheimer's, a brain disease that causes memory loss and other cognitive impairment. It's the most common cause of dementia in older adults.
Older woman with Alzheimer's looking out a window