Types of Dementia Explained: A Guide for Families

Topic cluster: Dementia & Memory Care | Reading time: 7 min

Dementia is not one condition — it is an umbrella term covering several distinct diseases that affect the brain in different ways. Understanding which type of dementia your parent has can help you anticipate what changes to expect, what support is most effective, and what the future might look like.

What Is Dementia?

Dementia is a syndrome — a collection of symptoms — caused by damage to brain cells. The damage interferes with memory, thinking, language, and the ability to carry out everyday tasks. It is progressive, meaning it worsens over time, and it is life-limiting.

There is currently no cure for dementia, but treatments and support can help manage symptoms, maintain quality of life, and slow some types of progression.

Alzheimer's Disease

Most common type: Accounts for 60–70% of all dementia cases in the UK.

Alzheimer's is caused by the build-up of two abnormal proteins in the brain — amyloid plaques and tau tangles — which disrupt communication between brain cells and eventually cause them to die.

Typical progression:

Early: Short-term memory problems, repeating questions, misplacing items, difficulty finding words
Middle: Increasing confusion, difficulty with daily tasks, personality and behavioural changes
Late: Loss of mobility, communication, and continence; full-time care required

Alzheimer's typically progresses slowly over many years. Medication (acetylcholinesterase inhibitors such as donepezil, rivastigmine, and galantamine) can help manage symptoms in mild to moderate stages.

Vascular Dementia

Second most common: Accounts for around 20% of cases.

Caused by reduced blood flow to the brain — typically following a stroke or a series of mini-strokes (TIAs). Brain cells die when deprived of oxygen.

Key differences from Alzheimer's:

Progression may be more stepped (noticeable changes after strokes) rather than gradual
Often more prominent problems with planning, attention, and speed of thinking
Memory may be less severely affected in early stages
Risk factors include high blood pressure, diabetes, smoking, and high cholesterol

Managing vascular risk factors (blood pressure, diabetes, cholesterol) can help slow further progression.

Lewy Body Dementia

Lewy body dementia (LBD) includes both dementia with Lewy bodies and Parkinson's disease dementia.

Distinctive features:

Visual hallucinations (seeing things that aren't there) — sometimes from an early stage
Fluctuating alertness and cognition (days of relative clarity alternating with confusion)
Movement difficulties similar to Parkinson's disease (tremor, stiffness, slowness)
REM sleep behaviour disorder (acting out dreams)

LBD is complex to manage because some standard medications — including many antipsychotics — can cause severe reactions in people with Lewy bodies. Always ensure any prescriber is aware of the diagnosis.

Frontotemporal Dementia (FTD)

Less common but particularly significant because it often affects people in their 50s and early 60s — younger than typical dementia onset.

FTD is caused by damage to the frontal and temporal lobes of the brain, which govern personality, behaviour, and language.

Types include:

Behavioural variant FTD — personality changes, loss of inhibitions, inappropriate social behaviour, apathy, compulsive behaviours
Semantic dementia — progressive loss of word meaning and object recognition
Progressive non-fluent aphasia — difficulty producing speech

Memory is often relatively preserved in early FTD. The behavioural changes can be mistaken for psychiatric illness or relationship difficulties, leading to delayed diagnosis.

Mixed Dementia

Many people have more than one type of dementia simultaneously — most commonly Alzheimer's plus vascular dementia. Mixed dementia is thought to be more common than previously recognised, particularly in people over 80.

Rarer Types of Dementia

Posterior cortical atrophy — a variant of Alzheimer's that primarily affects vision and spatial awareness
Corticobasal syndrome — rare, involving motor and cognitive difficulties
Creutzfeldt-Jakob disease (CJD) — a rare, rapidly progressive prion disease

Why the Type of Dementia Matters for Care

Type	Key care considerations
Alzheimer's	Routine and consistency; memory aids; safe environment
Vascular dementia	Managing vascular risk factors; stroke rehabilitation where needed
Lewy body	Careful medication management; falls risk; hallucination management
Frontotemporal	Behavioural management; supports for family relationships

A specialist memory clinic or consultant psychiatrist (old age psychiatry) can advise on type-specific management.

Getting a Diagnosis

If you suspect your parent has dementia, the starting point is the GP. They may carry out initial cognitive screening and then refer to a memory clinic for a formal assessment and diagnosis. A specialist diagnosis is important — it identifies the type of dementia, enables appropriate treatment, opens access to post-diagnosis support, and is necessary for many benefit applications.

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