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What is the third stage of Alzheimer's disease?

David B. Reuben, MD
Geriatric Medicine
The third stage of Alzheimer’s disease is having the full-blown disease. Memory is impaired, and over a period of about 10 years, it virtually disappears. Agitation and aggression are also common. In about 80% of cases, people become agitated, even physically or verbally abusive.

There are also non-cognitive symptoms -- things that don’t relate to memory -- in the third stage of Alzheimer's disease. These include psychotic symptoms such as; delusions, which occur in about 20% of those affected; and depressive symptoms, which occur in about 40%. Depression may also be a very early sign of Alzheimer’s disease.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.