Dementia vs Alzheimer’s: What’s the Difference?Dementia vs Alzheimer's: What's the Difference? 

Dementia affects a significant number of seniors. So does Alzheimer’s. Both subjects get talked about a lot these days, which causes some people to wonder: just what is the difference between dementia vs Alzheimer’s?

What is Dementia?

To start, you should understand what dementia is. According to the World Health Organization, dementia is characterized by “deterioration in memory, thinking, behaviour and the ability to perform everyday activities.”

The term isn’t used to describe a specific disease, so much as a collection of symptoms that can be caused by a number of different diseases.

While it’s normal for seniors to start having memory issues the more they age, dementia goes a few steps further. When seniors start to lose the ability to finish sentences because they can’t remember how they started, lose track of what day or month it is, and have difficulty making basic financial and life decisions, they’ve likely tipped from normal memory loss into dementia and families should get them to a doctor.

Alzheimer’s is the leading cause of dementia.

Alzheimer’s and dementia aren’t synonymous terms, but everyone who has Alzheimer’s either already has or will have dementia. The confusion is natural though, as the vast majority of dementia cases – around 75% – are caused by Alzheimer’s. And it’s not always possible to diagnose Alzheimer’s with 100% accuracy, so a doctor’s first guess in encountering someone with dementia is likely to be that they’re exhibiting signs of Alzheimer’s.

While most seniors with dementia have Alzheimer’s, it’s possible to have dementia that’s caused by any one of a number of other disorders.

Other Diseases that Cause Dementia

In addition to Alzheimer’s, seniors diagnosed with any of the following are also likely to show signs of dementia:

  • Vascular dementia – Vascular or multi-infarct dementia is responsible for about 10% of all cases of dementia and occurs after a person experiences one or more strokes.
  • Dementia with lewy bodies – Lewy body dementia affects over 1 million people in the US and is caused by a buildup of abnormal lewy bodies which affect the brain’s chemistry.
  • Parkinson’s disease – Parkinson’s disease is often diagnosed in middle age and starts with physical symptoms, then later progresses to include the symptoms commonly associated with dementia.
  • Huntington’s disease – Huntington’s disease is similar in its symptoms to Parkinson’s, but often starts when patients are even younger. It starts with physical symptoms, but often begins to include dementia as patients get older.
  • Frontotemporal dementia – This category contains a few different types of diseases associated with dementia, including behavioral variant FTD, Pick’s disease, and primary progressive aphasia.
  • Creutzfeldt-Jakob disease- CJD is a rare brain disorder that affects memory, coordination, and behavior and is ultimately fatal.
  • Normal pressure hydrocephalus – This is a form of dementia caused by a buildup of fluid in the brain.
  • Wernicke-Korsakoff Syndrome – Korsakoff syndrome is a type of dementia caused by vitamin B-1 deficiency and is often associated with alcohol abuse.

As you can see, dementia can be caused by a number of diseases and factors other than Alzheimer’s, and yet it still makes sense for the two terms to be closely linked. For most seniors that struggle with dementia, Alzheimer’s is the most likely culprit.

Kristen Hicks is an Austin-based copywriter and lifelong student with an ongoing curiousity to learn and explore new things. She turns that interest to researching and exploring subjects helpful to seniors and their families for


  1. Paulan M Gordon March 25, 2017 Reply

    Excellent explanation of the various types of dementia and symptoms! I didn’t see a way to share this report. If there is one, please let me know.

  2. Melinda Newman March 25, 2017 Reply

    My husband has small vessel disease. It comes under dementia but I didn’t see that on the list.

  3. Christopher F Holland March 25, 2017 Reply

    How soon as fter a preliminary diagnosis of
    Alzheimer’s does a diagnosis be come more certain?

  4. Christopher F Holland March 25, 2017 Reply

    See above

  5. Judah Gutwein March 25, 2017 Reply

    Great read!

  6. John B March 27, 2017 Reply

    So….what specifically is Alzheimer’s?
    You have described dementia well enough, but you have not given a clinical/layman’s description of what Alzheimer’s is.

  7. Marion Franco June 4, 2017 Reply

    i have been diagnosed in 2018 with nph hydrocephalus. I have a shunt since then to drain the liquid. No one said anything to me about dementia. I do have senior moments. I do think I should see my neurologist or surgeon as I pain by shuts and/or cathertur, can you advise ?

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