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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.

Articles

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

What Is Dementia?

Dementia is a loss of thinking, remembering, and reasoning skills that interferes with a person’s daily life and activities. While dementia is more common with advanced age, it is not a normal part of aging. Learn why.
Older woman with glasses wearing a sari

Types of Dementia

Alzheimer's disease is the most common type of dementia. Learn about other dementias, including Lewy body dementia, frontotemporal disorders, vascular dementia, and mixed dementia.
Hispanic man with dementia sitting in a park