Senior’s Health

What’s the difference between delirium and dementia?

Delirium comes on suddenly over a few hours, or a few days. It may be temporary, but can last from a few days to several weeks. It may take weeks or months to recover.

Dementia is a slow, steady decline in function over several months or years. Alzheimer’s disease is one type of dementia.

Delirium in someone with dementia can be harder to see. You may notice a sudden change in behaviour (e.g., the person is more agitated). You may also notice that the person may not be able to do things as well, or has trouble paying attention. Telling a doctor, nurse, or other healthcare provider about the changes you see is very helpful because you know the person best.

Current as of: November 21, 2018

Author: Senior’s Health Strategic Clinical Network, Alberta Health Services

This material is not a substitute for the advice of a qualified health professional. This material is intended for general information only and is provided on an "as is", "where is" basis. Although reasonable efforts were made to confirm the accuracy of the information, Alberta Health Services does not make any representation or warranty, express, implied or statutory, as to the accuracy, reliability, completeness, applicability or fitness for a particular purpose of such information. Alberta Health Services expressly disclaims all liability for the use of these materials, and for any claims, actions, demands or suits arising from such use.

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What’s the difference between delirium and dementia?