What Are the Different Types of Dementia?
For a long time I genuinely thought dementia was just one thing. I've since learned a lot of people think Alzheimer's and dementia are the same word for the same condition. If either of those sounds familiar, you're in good company. Understanding the difference makes a lot of confusing conversations with doctors much easier to follow.
Dementia is the umbrella, not the disease
Dementia is an umbrella term for a set of symptoms, things like memory loss, confusion, personality changes and the kind of everyday changes we've covered across this blog. It isn't one specific disease. Alzheimer's disease is one particular cause of dementia, the most common one by a long way, but not the only one. Asking "Alzheimer's or dementia" is a bit like asking "cake or chocolate cake." One is the category. The other is a particular kind within it. Once that distinction clicks, a lot of confusing medical conversation gets a lot easier to follow.
Alzheimer's disease and vascular dementia
Alzheimer's disease is caused by particular protein changes in the brain that gradually damage how brain cells connect and communicate with one another. It's the most common cause of dementia in Australia. It tends to follow a fairly gradual, steady pattern, usually starting with memory and word-finding problems before broadening out to affect more of daily life over time.
Vascular dementia is caused by reduced blood flow to the brain, often after small strokes. Sometimes the person doesn't even notice these happening at the time. Sometimes they're only picked up in hindsight, once a pattern of decline is examined properly. The key difference is that vascular dementia can progress in noticeable steps rather than a slow, steady slide, a plateau for months, then a sudden drop, then another plateau and so on. Knowing that step pattern, as opposed to a steady slope, helps anyone watching it happen make sense of what they're seeing instead of assuming every dementia looks the same from the outside.
Lewy body, frontotemporal and mixed dementia
Lewy body dementia is caused by clumps of protein called Lewy bodies in the brain. Its calling card is often visual hallucinations plus pronounced fluctuations, good hours and bad hours within the same day, along with movement symptoms similar to Parkinson's disease. It's a distinct presentation and one worth knowing about specifically if hallucinations become part of the picture, since that changes what kind of support and monitoring makes sense.
Frontotemporal dementia affects the front and side parts of the brain first, so instead of memory being the earliest sign, it's often personality, judgement and social behaviour that change first, sometimes quite dramatically. It also tends to appear in younger people, in their fifties and sixties, more than the other types, which can make it a particularly disorienting diagnosis for families who assumed dementia was purely an "old age" condition. Mixed dementia simply means someone has more than one type at once, most often Alzheimer's and vascular together, since they share some of the same risk factors. It's considerably more common than most people realise, especially in older age.
Causes and whether it's hereditary
Age is the single biggest risk factor for dementia, alongside a mix of genetics, heart and blood vessel health and sometimes specific events like small strokes. It's rarely down to one single, identifiable cause, which can be frustrating for families looking for a clear explanation. As for whether it's hereditary, for the vast majority of cases, no. Having a parent with dementia doesn't make it inevitable for you. There are some rare, specific genetic forms that do run strongly in families, but they're a small slice of all cases. For most families, it's much more about age and general health than genetics alone, which is worth saying plainly to anyone quietly worrying about their own future.
Whatever the specific type turns out to be, the approach to getting a diagnosis stays the same. See the GP, don't self-diagnose off the internet at midnight and know that the type does matter for treatment, monitoring and planning, even though day-to-day support often looks broadly similar across all of them.
Why the name on the diagnosis matters
Ask your specialist directly which type of dementia is involved and write the answer down, because it shapes what to expect next. Vascular dementia might mean particular attention to heart and blood pressure management, since that can help slow further small strokes. With Lewy body dementia, certain medications need extra care, because they can affect people with this type differently. A frontotemporal diagnosis in a younger person might point toward different support services than those built for an older cohort.
None of this changes how much you love the person in front of you and it doesn't need to be understood perfectly on day one. But the right name for what's happening opens the door to better information, the right support groups and more useful conversations with specialists, instead of trying to apply generic dementia advice to something that might need a bit more precision.
A note on this article
This article is general information only, drawn from publicly available Australian health and aged care guidance and from my own experience running Dementia Care Supplies and talking with families going through this. It is not medical advice. If you're concerned about yourself or someone you care about, please see your GP.
For more information and support, see Dementia Australia, My Aged Care and Healthdirect Australia.
If you need to talk to someone now, the National Dementia Helpline is available on 1800 100 500, any day of the week.
Dementia Care Supplies is an Australian, family-run supplier of practical, dignity-first products for people living with dementia and the families who care for them.