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Understanding the Types and Stages of Dementia

Lorna is a qualified psychologist and writer with an interest in drawing awareness to and informing others of mental health issues.

One of the world’s greatest medical challenges...

Research shows that in the UK alone, someone will develop dementia every three minutes, and by 2051, an estimated 3% of the population will have dementia. An understanding of dementia, its impact on our lives, and how we can help in the ongoing fight to finding a cure is absolutely critical, both for ourselves and future generations.


What Is Dementia?

Not a disease in itself, dementia is the term used for a series of diseases or neurological disorders with similar symptoms that effect the brain. At least two brain functions have to be affected due to mental impairment in order to be diagnosed with dementia. Memory, thinking, language, judgment and behaviour may all be affected by dementia, with mental impairment ranging from mild to severe. It is extremely important that a proper diagnosis is made, which will result in the correct evaluation and necessary treatment being initiated.

Types of Dementia

There are different types of dementia and some people may have a combination of types, however, dementia is unique to each person who experiences it. These are the most common types.

Alzheimer’s Disease

Characterised by brain cell death due to the build up of proteins causing Plaques and Tangles, Alzheimer’s is the most common type of dementia, affecting between 60-80 percent of cases. Over time, the numbers of damaged cells will increase and, as a result, the brain’s function becomes more limited. Initially affecting short-term memory, it usually results in everyday tasks becoming more difficult to perform; however, people may experience it differently as no two people are the same.

Vascular Dementia

The second most common form of dementia and difficult to diagnose, vascular dementia occurs when blood vessels in the brain are damaged, which reduces blood flow carrying oxygen and nutrients to the brain cells. This usually happens after a stroke or a series of ‘mini-strokes’, and is most common in those people between the ages of 60-70.

Vascular dementia is a progressive condition which tends to worsen in steps, differing from the more gradual progression of other forms of dementia. There are also periods of stable behaviour; however, this is usually a temporary situation, as over time brain damage could eventually lead to problems with memory, decision-making, attention and daily living. Usually people with this type of dementia live for approximately five years after the onset of symptoms.


Lewy Body Dementia

Affecting around ten percent of people diagnosed with dementia, this type is caused by small round deposits known as ‘Lewy Bodies’ which damage the tissue of the brain. As a result, the brain does not function as well as it should when receiving and sending messages. People with this type of dementia not only suffer with memory loss but can have hallucinations, tremors, physical stiffness and muscle weakness in their arms and legs. This type of dementia has many symptoms in common with Parkinson’s Disease such that with both conditions, the Lewy Body protein deposits are seen in brain cells. It should be noted that people with Lewy Body Dementia do not necessarily have symptoms of Parkinson’s; likewise, only some people with Parkinson’s may develop this type of dementia.

Frontotemporal Dementia

An umbrella term to describe several types of dementia with one thing in common: the front and side parts of the brain controlling language and behaviour are all affected. Sometimes known as ‘Pick’s disease’, this type of dementia may affect people as young as 45 years of age. Research has shown that even though the exact cause is not yet known, it does have a tendency to run in families, as people with it have mutations in certain genes. Symptoms range from loss of inhibitions and motivation, as well as speech problems and compulsive behaviour.

Mixed Dementia

Extremely common and refers to a situation where more than one type of dementia has been diagnosed. The most common combination is Alzheimer’s and vascular dementia, and research has shown that 45 percent of people with dementia have mixed dementia but are not aware of it. Causing different symptoms in different people, some may experience memory loss first while others experience behaviour and mood changes. However, the majority of people diagnosed will have difficulty walking and speaking as the disease progresses.

Dementia is our most feared illness, more than heart disease or cancer.

— David Perimutter

Stages of Dementia

Dividing the course of the particular type of dementia into stages will enable caregivers and medical professionals to measure the progress of a person’s cognitive health or decline; appropriate treatment will then be determined depending on their condition. Stages are not always exact and symptoms can be unpredictable, however, understanding these stages will ease the uncertainty of not knowing what is going to happen next. Once a proper diagnosis has been made, the stages can then be used as a guideline, enabling you to plan for the future. Dementia is usually divided into three stages.

Early Stage Dementia

Early stage dementia is not always easy to spot as the person may still have the ability to live independently—working, driving and socialising. Making it harder is the fact that being forgetful is in itself a symptom of getting older, however, forgetting familiar words or not being able to plan or organise the way they used to is usually a good indication that something is not right.

It’s important at this stage that the person is given a thorough medical examination by their doctor. There are a range of tests used to determine whether a person has dementia; physical exam, neurological exam, mental status tests, and other tests just to rule out other causes of symptoms.

Symptoms of Early Stage Dementia

  • Frequently losing or misplacing things
  • Struggling when trying to find the right word or name
  • Having trouble planning or being able to organise on a daily basis
  • Forgetting something they just listened to or read
  • Feeling angry or frustrated
  • Constantly repeating
  • Experiencing low mood

Middle Stage Dementia

Middle stage dementia often lasts the longest, with the symptoms of dementia much more apparent. Increased levels of care will now be needed as people experiencing this stage of dementia are likely to require more assistance in their daily lives.

Symptoms of Middle Stage Dementia

  • Everyday tasks such as bathing and grooming will become more difficult, and assistance will be needed with these tasks
  • Sleep patterns will change as the person may sleep more during the day and feel restless at night
  • Behavioural and personality changes are more common and are often caused by unfounded suspicion and agitation, resulting in paranoia, repetitive behaviour and delusions
  • Levels of confusion are elevated
  • Greater memory loss
  • Some people will experience incontinence
  • Becoming withdrawn, especially in social situations.
  • There is an increased risk of wandering, especially at night, and getting lost

Later Stage Dementia

The person will need increasing amounts of care and support during the later stage of dementia. As they become increasingly frail, they may find it difficult to walk and may even be confined to bed. At this stage, their immune system is extremely low and they do not have the ability to fight off even simple infections. Although communicating is extremely difficult at this late stage, it is worth noting that many people will respond positively to a smile, affection and a soothing voice. Music can also be a source of comfort and enjoyment.

Symptoms of Later Stage Dementia

  • Totally incontinent
  • There is a gradual loss of speech
  • Eating and swallowing is difficult
  • There is very little recognition at this stage of family or friends, although sometimes there are flashes of recognition
  • Increased feelings of restlessness

Defeating Dementia

Evidence has shown that lifestyle changes such as eating a heart-healthy diet, stopping smoking and cutting back on alcohol can help protect the brain and reduce the risk of dementia later on. Patients, families and the public can now take part in research to help prevent dementia, manage it better and find a cure. If more volunteers are willing to participate in studies, then researchers can explore their ideas and find ways to help people live a better life.

Personal Thoughts

My father sadly passed away six years ago with complications resulting from dementia with Lewy Bodies. My own feelings of this experience were mainly of helplessness and a sadness which never really goes away. Dad was cared for at home until it became necessary to have him moved into specialist care.


I once asked my mother how she personally coped during the hardest of times. She said that she remembered his patience, especially when we were little and he was teaching us how to ride our bikes. She remembered his understanding during those rebellious teenage years and his unwavering support if things went wrong as we grew into adults. Mostly she remembered his unconditional love, and this to her was the best coping strategy of all.

This content is for informational purposes only and does not substitute for formal and individualized diagnosis, prognosis, treatment, prescription, and/or dietary advice from a licensed medical professional. Do not stop or alter your current course of treatment. If pregnant or nursing, consult with a qualified provider on an individual basis. Seek immediate help if you are experiencing a medical emergency.

© 2019 Lorna Lamon


Lorna Lamon (author) on June 11, 2020:

It is a cruel disease Peggy and takes its toll on those family members who see a little piece of their loved one disappear each day. My dad was quite young when he passed which somehow made it harder to bear. Thank you for kindly commenting.

Peggy Woods from Houston, Texas on June 11, 2020:

These types of diseases affect the entire family. I have had several family members who eventually died of dementia. So very sorry you lost your dad in that manner. Like you wrote, it is so hard seeing them slipping away.

Lorna Lamon (author) on June 10, 2020:

It is such a cruel disease Brenda and lockdown even though necessary has only added to the pain. I feel for your mother as I saw my own mum suffer greatly with the strain. It does affect so many people in different ways and I hope they continue researching in order to find a cure. I'm glad you found this article of help and thank you for your kind comments. Take care.

BRENDA ARLEDGE from Washington Court House on June 09, 2020:


This is a well written article with lots of knowledge that is useful.

Dementia / Alzheimer's is such an awful disease.

My mother had to place her husband into nursing home and this is such a trying time since no visitors are allowed.

Plus she is upset on most days and seems lost without him.

She fell yesterday from low blood pressure from not eating properly I suppose.

It effects everyone involved.

Have a great day.

Lorna Lamon (author) on March 28, 2020:

It is such a tragic illness and particularly so for those closest to the person. I am hoping that a cure will be found soon Denise. Your comments are always appreciated. Take care.

Denise McGill from Fresno CA on March 27, 2020:

All dementia is horrific. My grandfather passed from Alzheimer's. My mother told me after watching it take his mind that she would rather die of cancer than to have Alzheimer's. I don't like to think of her leaving us either way but maybe she has a point. The robbing of the mind is horrible.



Lorna Lamon (author) on October 28, 2019:

Hi Wendy, Sadly my father suffered with Lewy Body Dementia and watching him slip away was heartbreaking. I work with the Red Cross in Aged Care Homes and I also consider it a privilege to be able to help these wonderful people. Thank you for commenting and I'm glad you found this article useful.

TripleAMom from Florida on October 27, 2019:

Another really good article. Thanks for spelling out the different types of dementia. I have never taken the time to research types I just knew that Alzheimer's was a form of dementia. Two days a week i work in nursing homes doing therapy and part of it is depression or anxiety from dementia or the early memory loss that they know they have. It's sad to watch but I'm thankful that I can work with them.

Lorna Lamon (author) on August 03, 2019:

It's so difficult to watch a loved one disappear a little more each day. I feel understanding the condition helps people to cope. Thank you for commenting Dream On, I appreciate it.

DREAM ON on August 02, 2019:

We think my mother had a form of dementia that we were just starting to understand and I could notice mood swings and her behavior from rational to irrational quickly. It is tough to see. Thank you for explaining more about dementia and Azheimer's disease.

Lorna Lamon (author) on January 25, 2019:

Thank you for your comments Liz and I am glad you found the article informative. The statistics are a stark reminder of what needs to be done, and I believe that we all have a role to play in this.

Lorna Lamon (author) on January 25, 2019:

Thank you for your comments Bill - it's an uphill battle but I do believe there is a light at the end of the tunnel, and if we all work together we can make it a reality.

Liz Westwood from UK on January 25, 2019:

I have learned a lot from your very informative article. My only hope is that in the years to come more research will be done into cause, prevention, treatment and hopefully eventually cure of dementia. The statistics are frightening. Thank you for sharing your own family's difficult experience.

Bill De Giulio from Massachusetts on January 25, 2019:

Hi Lorna. Well written and very informative. With the increase in this dreaded condition this is information we should all be aware of. I had an uncle and my grandmother who died of Alzheimer's and it was painful to experience. I don't know how anyone who is close to someone going through this keeps their sanity. Hopefully research finds an answer!

Lorna Lamon (author) on January 25, 2019:

Most people I know have a loved one who has passed away or in the stages of dementia. I really hope together we can find a cure. Thank you for your comment.

Ellison Hartley from Maryland, USA on January 24, 2019:

This was a very interesting article, and definitely hits close to home for me, I lost my grandmother to Alzheimer's it is the most awful thing to watch a loved one lose themselves and all their memories,

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