February 26, 2026
/Beginner Series · Article 2
What Is Dementia? A Plain-Language Guide to the Most Common Types
A clear explanation of Alzheimer's, vascular dementia, Lewy body, FTD, and more
If someone you love has just been diagnosed with dementia — or if you're still in the process of figuring out what's happening — the word itself can feel overwhelming. It carries weight. It raises fears. And it often comes with a flood of medical terminology that's hard to absorb when you're sitting in a doctor's office trying to hold it together.
Let's slow that down. Here's what dementia actually is, in plain language — and what the most common forms mean for the people living with them.
Dementia Is Not a Single Disease
This is one of the most important things families learn: dementia is an umbrella term, not a specific diagnosis. It describes a group of symptoms — affecting memory, thinking, communication, and the ability to perform everyday tasks — caused by damage to the brain. That damage can come from several different conditions, each with its own patterns and progression.
Think of it this way: a fever isn't a disease — it's a symptom of something happening in the body. Dementia works similarly. The specific type matters because it shapes how the condition progresses, which symptoms are most prominent, and what care approaches are most helpful.
The Most Common Types
The most common form. Caused by gradual protein buildup in brain cells. Early Alzheimer's typically affects short-term memory first — recent conversations, recent events — while long-term memories often remain more intact early on.
Occurs when reduced blood flow — often following a stroke — damages brain tissue. Can appear more suddenly than Alzheimer's. Problems with planning, judgment, and processing speed are often more prominent early than memory loss.
Caused by abnormal protein deposits in nerve cells. Associated with vivid visual hallucinations, significant fluctuations in alertness, and movement symptoms similar to Parkinson's. Can be challenging to diagnose because it resembles other conditions.
Affects the frontal and temporal lobes — responsible for personality, behavior, and language. Unlike Alzheimer's, memory is often relatively preserved early on. Families often first notice dramatic personality changes or significant language difficulties.
It's also worth knowing that mixed dementia — where more than one type is present simultaneously — is increasingly recognized as common, particularly in older adults. Alzheimer's combined with vascular changes is the most frequent combination.
What This Means for Your Family
Important to Know
Every dementia journey is different. Even two people with the same diagnosis can experience it very differently. The type, a person's overall health, their support network, and the care environment all shape how life with dementia unfolds. A diagnosis is a starting point — not a destination.
Our memory care teams are trained in Montessori-style personalized dementia care — meaning we meet each resident exactly where they are, with a care plan built around their individual history, strengths, and preferences. No two care plans look alike, because no two people do either.
What to Do Right After a Diagnosis
Understand the specific type and current stage.
Ask the diagnosing physician to explain exactly what type of dementia has been identified and how advanced it is. This shapes everything that comes next.
Get a specialist if you haven't already.
A neurologist or geriatrician with dementia experience can provide a fuller picture, confirm the diagnosis, and discuss treatment or management options.
Don't feel pressured to make care decisions immediately.
There's time to gather information. Explore resources, ask questions, and make thoughtful decisions — not reactive ones driven by panic.
Take care of yourself too.
A dementia diagnosis affects the whole family. The caregiver's wellbeing matters. Start building your support network now, before you feel like you need it.
This resource library is one of the tools we've built to help you do exactly that — understand what's happening, navigate the options, and feel less alone. We'll walk through it all together, at a pace that works for you.
Up Next in This Series
What does a memory care community actually do? We explain how specialized care differs from standard assisted living — and when it might be the right step for your family.