What’s the Difference Between Alzheimer’s and Dementia? A GP Explains

By Dr Simon Khela MBChB MRCGP, Medical Director, Private Medical Clinic

Introduction

One of the most common questions I hear from patients and their families is:

“Does my mum have Alzheimer’s, or is it dementia?”

It’s an understandable question. The terms Alzheimer’s and dementia are often used interchangeably in newspapers, television programmes and everyday conversation, leading many people to believe they’re the same condition.

They’re not.

Understanding the difference is important because it helps people recognise symptoms earlier, understand what a diagnosis means and seek the right medical advice and support. It’s a concern that’s become more common too, and dementia is now the UK’s biggest health fear according to recent surveys.

As a GP, I regularly meet people who are worried about memory problems, either their own or those of someone they love. Sometimes those concerns are related to dementia. Sometimes they’re caused by something entirely different, such as stress, poor sleep, anxiety, depression or even vitamin deficiencies.

That’s why it’s important not to jump to conclusions.

A proper memory assessment can often identify the cause of memory problems and, in some cases, uncover conditions that are treatable.

In this guide, I’ll explain the difference between Alzheimer’s disease and dementia, discuss the various types of dementia, outline the early warning signs, explain how doctors make a diagnosis and highlight when it’s important to seek medical advice.

What’s the Difference Between Alzheimer’s and Dementia?

Dementia is an umbrella term used to describe a group of symptoms that affect memory, thinking, communication and everyday functioning. Alzheimer’s disease is the most common cause of dementia, accounting for around 60–70% of all dementia cases. Put simply, all Alzheimer’s disease causes dementia, but not all dementia is Alzheimer’s disease.

This distinction often surprises patients.

Think of dementia as the broad category and Alzheimer’s disease as one specific condition within that category.

It’s similar to the relationship between heart disease and heart attacks. A heart attack is one form of heart disease, but heart disease includes many other conditions too, which is why we cover heart health as its own area of assessment at our clinics.

Likewise, dementia has several different causes, and Alzheimer’s is only one of them. The NHS’s overview of dementia sets out this same distinction for patients researching the condition themselves.

What Is Dementia?

Dementia isn’t a single disease.

Instead, it’s the name given to a collection of symptoms caused by damage to the brain.

These symptoms may affect:

·       Memory

·       Thinking

·       Concentration

·       Language

·       Judgement

·       Behaviour

·       Problem-solving

·       Understanding

·       Orientation

·       Everyday activities

For a diagnosis of dementia, these symptoms must be severe enough to interfere with daily life.

For example, someone may begin struggling to:

·       Remember appointments

·       Manage finances

·       Prepare meals

·       Take medication correctly

·       Follow conversations

·       Drive safely

·       Find familiar locations

Occasional forgetfulness is completely normal and becomes more common as we age.

Forgetting where you left your keys or walking into a room and forgetting why you went there isn’t usually dementia. Interestingly, some of the more telling early clues turn up in unexpected places, such as during Christmas shopping, when planning and decision-making are put under more pressure than usual.

The concern arises when memory problems become persistent, progressive and begin affecting independence.

One important point I always explain to patients is that dementia develops gradually.

Symptoms often appear slowly over several months or even years, which means families sometimes don’t notice the changes until they’ve become quite significant.

What Is Alzheimer’s Disease?

Alzheimer’s disease is the most common cause of dementia.

It is a progressive neurological disease in which abnormal proteins gradually build up inside and around brain cells.

Over time, these changes damage and eventually destroy brain cells, affecting the brain’s ability to function normally. The NHS page on Alzheimer’s disease has more detail on this process if you want to read further.

Although Alzheimer’s disease is most commonly associated with memory loss, it affects much more than memory alone.

As the condition progresses, people may experience difficulties with:

·       Planning tasks

·       Making decisions

·       Finding the right words

·       Recognising familiar places

·       Understanding information

·       Managing everyday activities

·       Changes in personality or mood

The exact cause of Alzheimer’s disease isn’t fully understood.

Researchers believe it’s likely to result from a combination of factors, including:

·       Increasing age

·       Genetics

·       Lifestyle

·       Cardiovascular health

·       Environmental influences

While there is currently no cure, earlier diagnosis allows people and their families to access treatment, support services and future planning much sooner.

Alzheimer’s vs Dementia: What’s the Difference?

The easiest way to understand the difference is to compare them side by side.

A phrase I often use with patients is:

Dementia describes what is happening. Alzheimer’s explains why it’s happening.

Many people find this much easier to remember.

Why People Often Confuse the Two

There are several reasons why these terms are so commonly mixed up.

Firstly, Alzheimer’s disease is by far the most common type of dementia.

As a result, many people hear about Alzheimer’s far more often than they hear about other forms of dementia.

Secondly, the symptoms overlap considerably.

Memory loss, confusion and difficulty completing everyday tasks can occur in several different types of dementia, not just Alzheimer’s disease.

Finally, the media often uses the two terms interchangeably, which reinforces the misunderstanding.

From a medical perspective, however, making the distinction matters because different types of dementia can have different patterns of symptoms, rates of progression and treatment approaches. This is reflected in NICE’s clinical guideline on dementia assessment, management and support, which sets out different care pathways depending on the type diagnosed.

Is Memory Loss Always Alzheimer’s?

One of the biggest misconceptions I encounter in practice is that every memory problem must mean Alzheimer’s disease.

Fortunately, that isn’t the case.

Memory problems have many possible causes, including:

·       Stress

·       Anxiety

·       Depression

·       Poor sleep

·       Vitamin B12 deficiency

·       Thyroid disorders

·       Side effects of medication

·       Alcohol misuse

·       Hearing problems

·       Acute infections

In many cases, identifying and treating these underlying conditions can significantly improve memory and concentration. Vitamin B12 deficiency in particular is far more common than people realise, and it’s one of the first things we screen for.

This is one reason why patients experiencing persistent memory concerns often benefit from a comprehensive memory assessment rather than assuming dementia is the cause.

Depending on the symptoms, further investigations such as private blood tests may also be recommended to rule out potentially reversible causes before considering a diagnosis of dementia.

Why Early Assessment Matters

Many families delay seeking help because they worry about receiving a diagnosis.

Others assume that memory problems are simply a normal part of ageing.

Neither approach is helpful.

While some changes in memory occur naturally as we get older, significant changes should never be ignored.

Seeking medical advice early offers several advantages.

It allows doctors to:

·       Identify treatable causes of memory problems.

·       Arrange appropriate investigations.

·       Diagnose dementia earlier where present.

·       Begin treatment sooner where appropriate.

·       Provide support for families and carers.

·       Help patients plan for the future while they can still participate fully in decisions.

For many people, the greatest benefit isn’t necessarily receiving a diagnosis of dementia.

It’s receiving reassurance when dementia isn’t the cause.

A thorough private GP appointment or online GP consultation can be the first step in understanding what may be causing memory concerns and whether further assessment is needed. We also run dedicated memory clinics in London, Birmingham, Oxford, Newcastle, Leicester, Derby and Sutton Coldfield.

Types of Dementia: Understanding the Different Conditions

One of the reasons people find dementia confusing is that there isn’t just one type.

Dementia is an umbrella term that describes a group of symptoms caused by different diseases affecting the brain. While these conditions share similarities, they can affect people in different ways, progress at different rates and require different approaches to care.

Understanding the different types of dementia can help families recognise symptoms earlier and better understand what a diagnosis means.

Alzheimer’s Disease

Alzheimer’s disease is the most common form of dementia, accounting for approximately 60–70% of all cases.

It usually develops gradually, with memory problems often being the earliest symptom.

Someone with Alzheimer’s disease may begin to:

·       Forget recent conversations.

·       Ask the same question repeatedly.

·       Misplace everyday items.

·       Miss appointments.

·       Struggle to learn new information.

As the disease progresses, difficulties may extend beyond memory to include language, judgement, problem-solving and everyday activities.

Eventually, many people require increasing levels of support with personal care and daily living.

Vascular Dementia

Vascular dementia is the second most common type of dementia.

Rather than being caused by abnormal proteins like Alzheimer’s disease, vascular dementia develops because blood flow to parts of the brain has been reduced or interrupted.

This may occur after:

·       A stroke

·       Multiple small strokes

·       Long-term damage to small blood vessels

·       Poorly controlled cardiovascular disease

Symptoms often depend on which part of the brain has been affected.

Unlike Alzheimer’s disease, where memory loss is usually the first noticeable symptom, people with vascular dementia may initially experience:

·       Slower thinking

·       Difficulty concentrating

·       Poor planning

·       Reduced problem-solving ability

·       Changes in mood

Memory may remain relatively preserved during the early stages.

One important message I often discuss with patients is that many of the risk factors for vascular dementia are also risk factors for heart disease and stroke.

These include:

·       High blood pressure

·       Diabetes

·       High cholesterol

·       Smoking

·       Obesity

·       Physical inactivity

Managing these conditions through lifestyle changes and appropriate medical treatment can help reduce the risk of vascular dementia developing later in life. That means keeping on top of your blood pressure, diabetes testing and cholesterol levels.

Routine health check-ups play an important role in identifying these risk factors before they cause long-term damage.

Dementia with Lewy Bodies

Dementia with Lewy bodies is less common but has several distinctive features.

People may experience:

·       Visual hallucinations

·       Fluctuating attention

·       Parkinson’s-like movement problems

·       Sleep disturbances

·       Memory difficulties

One day, someone may appear relatively well, while the next they seem significantly more confused.

These fluctuations can make diagnosis more challenging.

Because some medications used for other types of dementia may not be suitable for people with Lewy body dementia, identifying the correct diagnosis is particularly important.

Frontotemporal Dementia

Frontotemporal dementia (FTD) affects the frontal and temporal lobes of the brain.

Unlike Alzheimer’s disease, memory may initially remain relatively intact.

Instead, the earliest changes often involve behaviour, personality or language.

Families sometimes notice that a loved one has become:

·       Socially inappropriate

·       Impulsive

·       Emotionally withdrawn

·       Less empathetic

·       Repetitive

·       Unable to find the right words

Because these changes can resemble depression, stress or mental health conditions, diagnosis is sometimes delayed, and it’s worth ruling out a private mental health assessment alongside a memory assessment where behaviour or mood changes are the dominant symptom.

Frontotemporal dementia is also more likely to affect people under the age of 65 compared with other forms of dementia. According to the National Institute on Aging, younger-onset dementia of this kind is one of the reasons why memory concerns in younger adults shouldn’t be dismissed as stress alone.

Comparing the Different Types of Dementia

Early Signs of Dementia

One of the challenges with dementia is that symptoms usually develop gradually.

Many families tell me that, looking back, the warning signs had been present for months, or even years, before they realised something wasn’t quite right.

Some of the most common early symptoms include:

Memory Problems

This goes beyond simply forgetting names occasionally.

Someone may:

·       Repeatedly ask the same questions.

·       Forget recent conversations.

·       Miss important appointments.

·       Become increasingly reliant on reminder notes.

Difficulty Completing Familiar Tasks

Tasks that were once routine may suddenly become difficult.

Examples include:

·       Following recipes.

·       Managing finances.

·       Using household appliances.

·       Taking medication correctly.

Problems with Language

People may struggle to:

·       Find the right word.

·       Follow conversations.

·       Repeat themselves frequently.

·       Lose track of what they’re saying.

Poor Judgement

Families sometimes notice unusual decisions, such as:

·       Giving away large sums of money.

·       Wearing inappropriate clothing for the weather.

·       Forgetting basic safety precautions.

Confusion About Time or Place

Someone may:

·       Forget the day or month.

·       Become lost on familiar routes.

·       Forget where they are.

·       Struggle to recognise familiar surroundings.

Personality or Behaviour Changes

These changes are often the most distressing for families.

A previously outgoing person may become withdrawn, while someone who was calm and patient may become irritable or suspicious.

These behavioural changes are particularly common in frontotemporal dementia.

How Is Dementia Diagnosed?

There is no single test that confirms dementia.

Instead, diagnosis involves carefully bringing together information from several different sources.

As a GP, my first priority is understanding exactly what symptoms have been occurring.

This usually includes speaking to both the patient and, where appropriate, a close family member or friend who has noticed changes over time.

The assessment may include:

·       A detailed medical history.

·       Medication review.

·       Cognitive assessment.

·       Physical examination.

·       Review of mood and mental health.

·       Functional assessment.

Depending on the findings, further investigations may be recommended.

Blood Tests

Several medical conditions can cause memory problems that resemble dementia.

These include:

·       Vitamin B12 deficiency

·       Thyroid disorders

·       Anaemia

·       Infection

·       Electrolyte imbalance

·       Liver disease

·       Kidney disease

Appropriate blood tests can help identify these potentially reversible causes before a diagnosis of dementia is considered.

Brain Imaging

Some patients may require:

·       CT scan

·       MRI scan

Brain imaging helps identify:

·       Stroke damage

·       Brain shrinkage

·       Tumours

·       Bleeding

·       Other neurological conditions

Specialist Referral

Where dementia is suspected, patients are often referred to a specialist memory clinic, neurologist or older adult psychiatrist for further assessment via specialist consultations and referrals.

A specialist referral may include more detailed cognitive testing and additional investigations to determine the specific type of dementia, following the pathway set out in the NICE dementia guideline.

Can Dementia Be Reversed?

This is another question I hear frequently.

The answer depends on the cause.

Most forms of dementia, including Alzheimer’s disease, cannot currently be reversed.

However, some conditions that cause memory problems can be treated successfully.

Examples include:

·       Vitamin deficiencies

·       Thyroid disease

·       Depression

·       Medication side effects

·       Severe sleep deprivation

·       Alcohol-related cognitive impairment

This is exactly why early assessment is so important.

Assuming that memory loss is “just old age” risks overlooking conditions that could be improved with the right treatment.

Even when dementia is diagnosed, identifying it early allows patients and families to access treatments, support services and future planning much sooner than if they wait until symptoms become severe.

Can Alzheimer’s Disease or Dementia Be Prevented?

One of the first questions many patients ask after learning about dementia is whether it can be prevented.

The honest answer is that there is currently no guaranteed way to prevent Alzheimer’s disease or other forms of dementia. However, growing evidence suggests that adopting a healthy lifestyle and managing certain medical conditions may help reduce the risk or delay the onset of cognitive decline.

The Lancet Commission on Dementia Prevention estimates that addressing modifiable risk factors throughout life could potentially prevent or delay up to 45% of dementia cases. While not every case is preventable, this highlights the important role lifestyle and overall health can play, a point also made in the UK government’s own public health guidance on dementia prevention.

Protecting Your Brain Starts with Protecting Your Body

Many of the same habits that reduce your risk of heart disease and stroke also support long-term brain health.

These include:

·       Keeping blood pressure within a healthy range.

·       Managing diabetes effectively.

·       Maintaining healthy cholesterol levels.

·       Eating a balanced diet rich in fruit, vegetables and wholegrains.

·       Exercising regularly.

·       Avoiding smoking.

·       Limiting alcohol intake.

·       Staying socially active.

·       Keeping your brain mentally stimulated.

·       Prioritising good-quality sleep.

One point I often emphasise to patients is that brain health isn’t something to think about only in later life. The choices we make in our forties, fifties and sixties can have a meaningful impact on cognitive health in the decades that follow, and this is true for menopause and its effects on cognitive health too.

For patients with risk factors such as high blood pressure, raised cholesterol or diabetes, regular health checks can help identify issues early and support long-term health.

The Link Between Blood Pressure and Dementia

Many people don’t realise that high blood pressure can affect much more than the heart.

Over time, uncontrolled blood pressure can damage the small blood vessels that supply the brain with oxygen and nutrients. This increases the risk of stroke and is one of the major contributors to vascular dementia.

High blood pressure often causes no symptoms, which is why it is sometimes referred to as a “silent” condition.

Routine monitoring, maintaining a healthy weight, reducing salt intake and taking prescribed medication where appropriate can all help reduce the risk of complications.

Protecting your heart health is one of the most important steps you can take to support healthy ageing.

Living Well with Dementia

Although dementia is a progressive condition, many people continue to live fulfilling and meaningful lives following diagnosis.

Early diagnosis allows patients and families to:

·       Understand the condition.

·       Access treatments where appropriate.

·       Plan for the future.

·       Build support networks.

·       Make informed decisions while the person can still actively participate.

Simple strategies can also make everyday life easier.

These include:

·       Keeping a consistent daily routine.

·       Using calendars and reminder apps.

·       Labelling cupboards and drawers.

·       Taking medication at the same time each day.

·       Staying physically active.

·       Maintaining social connections.

·       Eating a healthy, balanced diet.

·       Continuing hobbies and mentally stimulating activities.

Support is equally important for carers.

Family members often experience significant emotional and physical pressures while supporting someone with dementia. Seeking advice early and accessing local support services can make a considerable difference.

Common Myths About Alzheimer’s and Dementia

Myth 1: Alzheimer’s and dementia are the same thing. Fact: Dementia is a group of symptoms. Alzheimer’s disease is one specific cause of dementia.

Myth 2: Memory loss always means dementia. Fact: Memory problems can result from stress, anxiety, depression, poor sleep, medication side effects, thyroid disorders, vitamin deficiencies and many other conditions.

Myth 3: Dementia is a normal part of ageing. Fact: While some slowing of memory is common as we age, dementia is not a normal part of getting older.

Myth 4: Nothing can be done after diagnosis. Fact: Although there is currently no cure for most forms of dementia, treatments, lifestyle changes and support services can improve quality of life and help people remain independent for longer.

Myth 5: Only older people develop dementia. Fact: Although dementia is much more common in older adults, younger-onset dementia can affect people under the age of 65.

Dr Simon’s Advice

Perhaps the biggest misconception I encounter in practice is that memory problems should simply be accepted as part of getting older.

Many people delay seeking medical advice because they don’t want to worry their family or they fear receiving a diagnosis of dementia.

In reality, early assessment is almost always the better option.

I’ve seen patients whose memory problems were ultimately caused by vitamin deficiencies, thyroid disorders, depression or medication side effects, conditions that could be treated successfully once identified.

Even when dementia is diagnosed, identifying it early gives patients and their families valuable time to understand the condition, access support and make informed decisions about the future.

If you or someone close to you has noticed persistent changes in memory, thinking or behaviour, don’t ignore those concerns.

Speaking to a GP is an important first step. A memory assessment, together with appropriate blood tests and, where necessary, a specialist referral, can help determine the cause and guide the most appropriate care. You can contact us to book an appointment at a clinic near you, or find out more about our services and our team of GPs and specialists.

Key Takeaways

·       Dementia is a syndrome; Alzheimer’s disease is the most common cause of dementia.

·       Alzheimer’s accounts for around 60–70% of dementia diagnoses.

·       Several other conditions, including vascular dementia, Lewy body dementia and frontotemporal dementia, can also cause dementia.

·       Memory loss does not automatically mean Alzheimer’s disease.

·       Some causes of memory problems are reversible and should always be investigated.

·       Early assessment allows earlier diagnosis, treatment and support.

·       Managing blood pressure, diabetes, cholesterol and maintaining a healthy lifestyle may reduce the risk of developing dementia.

About the Author

Dr Simon Khela MBChB MRCGP is the Medical Director of Private Medical Clinic and an experienced UK General Practitioner with over a decade of clinical experience. He has a particular interest in preventive medicine, cognitive health and helping patients understand complex medical conditions through clear, evidence-based advice.

Dr Khela regularly supports patients with memory concerns, cognitive assessments, preventive health checks and the investigation of neurological symptoms. His approach focuses on early diagnosis, patient education and compassionate, person-centred care, ensuring individuals and their families have the information they need to make informed decisions about their health.

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