Many people use the terms dementia and Alzheimer’s interchangeably. While they are closely related, they are not the same thing.
In simple terms:
- Dementia is an umbrella term describing a collection of symptoms that affect memory, thinking, reasoning and behaviour.
- Alzheimer’s disease is a specific brain disease and the most common type of dementia.
Understanding the difference between dementia and Alzheimer’s can help families seek the right diagnosis, plan appropriate care, and better support people living with these conditions.
What Is Dementia?
Dementia is not a single disease. It is a syndrome caused by various conditions that damage the brain.
It is used to describe a progressive decline in cognitive function that goes beyond what would be expected from typical ageing and affects everyday life.
Common symptoms of dementia may include:
- Memory loss
- Difficulty with thinking or problem-solving
- Changes in communication
- Changes in behaviour, mood or personality
- Reduced ability to manage daily activities independently
There are many different types and causes of dementia, each affecting the brain in different ways.
What Is Alzheimer’s Disease?
Alzheimer’s disease is a specific, progressive brain disease and the most common cause of dementia.
According to the World Health Organisation (WHO), Alzheimer’s disease may account for 60–70% of dementia cases worldwide.
Alzheimer’s typically begins by affecting the part of the brain responsible for learning and memory. Over time, the condition progresses and symptoms become more pronounced.
Early symptoms often include:
- Difficulty remembering recent events
- Repeating questions or conversations
- Changes in thinking and reasoning
As Alzheimer’s progresses, people may experience:
- Increased confusion
- Changes in behaviour
- Difficulty recognising familiar people or places
- Reduced ability to carry out everyday tasks
Key Difference Between Dementia and Alzheimer’s
| Dementia | Alzheimer’s |
| An umbrella term for symptoms | A specific brain disease |
| Can be caused by several conditions | The most common cause of dementia |
| Describes what is happening | Describes why it is happening |
| Includes many different types | One specific type of dementia |
What Are the Four Main Types of Dementia?
While there are many forms of dementia, four types are most commonly diagnosed.
Alzheimer’s Disease
Memory difficulties are often one of the earliest signs of Alzheimer’s disease. Over time, people may also experience:
- Difficulty finding words
- Changes in vision and perception
- Impaired reasoning and judgement
- Reduced sense of time and place
Long-term memory may remain relatively strong in the earlier stages, while short-term memory becomes increasingly affected. It is common for a person with Alzheimer’s to remember the earlier years of their life well, but struggle to remember what they did the day before.
For this reason, people with Alzheimer’s demonstrate trouble with thinking and reasoning, and may have little sense of time. It may begin with everyday tasks such as cooking, driving, losing things, or managing finances becoming more difficult. In later stages, as the condition progresses, people may need full-time care and support as they can struggle with more significant abilities such as remembering how to swallow.
Lewy Body Dementia (LBD)
Lewy Body Dementia shares characteristics with both Alzheimer’s disease and Parkinson’s disease.
Common features include:
- Cognitive changes similar to Alzheimer’s
- Movement difficulties such as stiffness or slowed movement
- Visual hallucinations
- Sleep disturbances, including acting out dreams
Vascular Dementia
Vascular dementia is caused by reduced blood flow to the brain, often following a stroke or series of small strokes.
Symptoms can appear suddenly or develop gradually and may include:
- Changes in reasoning or decision-making
- Slowed thinking
- Personality or mood changes
Symptoms vary depending on which areas of the brain have been affected.
Frontotemporal Dementia (FTD)
Frontotemporal dementia affects the frontal and temporal lobes of the brain, which control behaviour, language and emotional regulation.
Common signs may include:
- Changes in personality or behaviour
- Acting impulsively or in socially inappropriate ways
- Language difficulties
- Reduced motivation
- Changes in eating habits
- Memory problems often appear later in the condition.
It is also common for FTD patients to be easily distracted, struggle with planning and organisation, and incur memory problems in the later stages of the disease.
How Is Alzheimer’s Dementia Diagnosed?
Diagnosing Alzheimer’s disease usually involves a combination of assessments, rather than a single test.
These may include:
- Memory and cognitive assessments
- Functional ability reviews
- Behavioural observations
- Medical and medication history
- Input from family members or people who know the individual well
Doctors will also carry out tests to rule out other possible causes of cognitive change, such as:
- Stroke
- Parkinson’s disease
- Depression
- Other physical health conditions
Early and accurate diagnosis can help people access the right care, support and planning at the right time.
Living Well With Dementia at Aria Care
More than 944,000 people are currently living with dementia in the UK, a figure expected to rise to one million by 2030 and 1.6 million by 2050.
At Aria Care, we are committed to supporting people living with dementia to live meaningful, fulfilled lives, whatever stage of their journey they are on.
Across our homes, we provide:
- Person-centred dementia care
- Specialist training for our teams
- Opportunities for social connection and meaningful activity
- Support for families and loved ones
Our approach focuses on understanding each individual’s life story, preferences and needs, so we can provide care that feels familiar, respectful and reassuring.
If you would like to learn more about dementia care at Aria Care, or are exploring care options for the future, we welcome you to find your local Aria Care home and arrange a visit.
