The Types of Dementia, Explained for Families (and Why the Type Matters)
When a doctor names a type of dementia — “vascular,” “Lewy body,” “frontotemporal” — most families nod, write it down, and look it up in the car. This is the version we wish we’d had in the waiting room: what each type actually means, in plain language, and why the answer changes how you prepare.
What this is, and isn’t: an orientation from the Care90 team, summarizing what leading health organizations say about the main types of dementia — not a diagnosis, and not medical advice. Your parent’s care team knows the full picture; bring your questions to them.
Why the type matters to a caregiver
When a doctor says “dementia,” they’re naming the syndrome — the symptoms. When they name a type, they’re identifying the underlying cause, and the cause shapes everything downstream. Types differ in their early symptoms, their typical progression, and even in which medications need caution. Knowing the type lets a caregiver prepare better questions and be less surprised by what comes next.
One thing to hold loosely: mixed dementia — more than one type at once — is more common than once believed, especially in older adults. If the care team describes a “mixed picture,” it simply means more than one process is present.
At a glance
| Type | Share of cases | Signature early features |
|---|---|---|
| Alzheimer’s disease | 60–70% | Memory for recent events, word-finding, following conversation |
| Vascular dementia | ~20% | Planning, concentration, processing speed; sometimes stepwise decline |
| Lewy body dementia | ~5–10% | Fluctuating alertness, visual hallucinations, movement changes |
| Frontotemporal dementia | ~5–10% | Personality/behaviour change, or language difficulty |
| Mixed dementia | Common | Reflects whichever types are present |
Percentages are approximate and vary by source and population. Sources: WHO; Alzheimer’s Association.
Alzheimer’s disease
The most common type (60–70% of cases), driven by amyloid plaques and tau tangles that build up in the brain over years (Alzheimer’s Association). The early signature is usually memory for recent events — forgetting conversations, misplacing things, getting lost somewhere familiar. Because it often progresses slowly, the early stage is frequently the best window for the person to take part in planning their own care.
→ For the terminology that trips up most families, see Alzheimer’s vs. Dementia.
Vascular dementia
The second most common type, caused by reduced or interrupted blood flow to the brain — strokes, mini-strokes, or narrowed vessels (Alzheimer’s Society UK). Unlike Alzheimer’s, the early trouble often shows up as problems with planning, concentration, and slowed thinking rather than memory. Progression is sometimes described as “stepwise” — periods of stability, then a step-change after a vascular event — though the pattern varies considerably from person to person.
Lewy body dementia
Marked by features that set it apart from Alzheimer’s: fluctuating alertness, vivid visual hallucinations, Parkinson’s-like movement changes, and acting out dreams during sleep (Alzheimer’s Association). Someone may be clear and coherent at one point in the day and confused hours later — which is part of the condition, not a behaviour to correct.
One consideration often flagged for families: the Alzheimer’s Association notes that people with Lewy body dementia can be sensitive to certain medications, particularly some antipsychotics (Alzheimer’s Association). It’s worth raising as an explicit question with the care team whenever a new medication is being considered — they hold the full picture.
Frontotemporal dementia (FTD)
Affects the brain areas governing personality, behaviour, and language — so the early changes are often personality or speech, not memory (Alzheimer’s Association). It’s less common overall but one of the more frequent types in people under 65. Two broad presentations: a behavioural variant (loss of inhibition, poor judgement, apathy) and a language variant (losing words or their meaning).
Because the changes can look like personality rather than illness, FTD is often especially hard on families — and easy for people outside the household to misread. If a parent is diagnosed before 65, see Younger-Onset Dementia.
Mixed dementia
More than one type at the same time — most commonly Alzheimer’s plus vascular dementia. Research suggests it’s more prevalent than was recognized in life (Alzheimer’s Association). For caregivers, the practical takeaway is that the picture may be more complex than a single label suggests — worth raising with the doctor if symptoms seem to span categories.
What to do with this
Your job isn’t to diagnose the type — it’s to know enough to ask good questions about it. Whichever type is named, the first practical steps are the same: get organized, keep a medication record, and bring written questions to each visit.
→ Turn the type into questions: What to Ask at Your Parent’s First Dementia Appointment. New to all of this? Start at My Parent Was Just Diagnosed. What Do I Do First?
FAQ
What’s the most common type of dementia? Alzheimer’s disease, an estimated 60–70% of cases. Vascular dementia is generally second.
Can the type change over time? The diagnosis can be refined as the picture becomes clearer, and more than one type can be present at once (mixed dementia). The care team updates the understanding as they learn more.
Does the type change how I prepare? The first organizing steps are the same for every type. The type mainly shapes the questions you bring and what to watch for — which is why it’s worth knowing.
Sources
| Claim | Source | Accessed |
|---|---|---|
| Types overview, shares of cases, mixed pathology | WHO Dementia Fact Sheet | 2026-06-13 |
| Alzheimer’s features and biology | Alzheimer’s Association — What Is Alzheimer’s? | 2026-06-13 |
| Vascular dementia | Alzheimer’s Society UK | 2026-06-13 |
| Lewy body dementia, medication caution | Alzheimer’s Association — Lewy Body Dementia | 2026-06-13 |
| Frontotemporal dementia | Alzheimer’s Association — FTD | 2026-06-13 |
| Mixed dementia | Alzheimer’s Association — Mixed Dementia | 2026-06-13 |
By Care90 Editorial — not doctors or clinicians. Care90 builds calm organizing systems for families after a parent’s diagnosis. Always consult your parent’s medical team for clinical advice.
Know the type. Then get organized around it. My Parent Was Just Diagnosed. What Do I Do First? — a 90-day system to get organized, ask better questions, and move forward with calm and clarity. Get it on Amazon — $9.99 Kindle / $19.99 Paperback →