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The four most common causes of dementia, and how you could adapt your strategies to best support a loved one

Portrait photo of happy elderly woman with her daughter

It’s estimated that almost half a million people in Australia today live with dementia, however the symptoms, causes and treatments can vary greatly. If you have a loved one who is displaying symptoms, understanding which type of dementia they may have can help to determine how to best support them.

Here at Mable, we recently posted about Alzheimer’s Disease, its symptoms, and where families can find support. It’s a disease that’s commonly confused with dementia, which can better be described as a set of symptoms, with Alzheimer’s being the most common cause.

What is dementia?

As defined by Dementia Australia, Dementia is an extremely broad set of symptoms, affecting nearly 1 in 10 people over the age of 65. Dementia is often used as a general term when talking about the cognitive decline associated with ageing – and it has many causes. The symptoms experienced will vary depending on the type of dementia that someone has.

As many children of ageing parents will attest, the onset of dementia symptoms can be gradual and extremely subtle. These subtle changes in a loved one can present challenges for families in understanding how best to provide support. Mable’s community of independent workers include many aged care professionals and nurses who are experienced with working with clients with dementia and will understand how to best support and comfort clients at all stages.

For family members, understanding what type of dementia your loved one has can go a long way to helping you support them to manage their symptoms.

What are the different types of dementia?

According to Dementia Australia, there are over 100 diseases that may cause dementia. We’ve taken a look at four of the most common causes in those who are ageing, and the behaviours that they might exhibit as a result.

Dementia caused by Alzheimer’s Disease

Alzheimer’s is the most common cause of dementia, and is characterised by the shrinking of the outer layer of the brain or cortex – the region of the brain involved in memory, language and judgment. In the early stages, short term memory loss will occur, with long term loss as the disease progresses. People may also exhibit vagueness in conversation, loss of enthusiasm for activities, forgetting people or places or difficulty processing questions and instructions. You may also see emotional predictability and deterioration of social skills. Symptoms vary and progress differently for each person – and their abilities can also change from day to day.

Alzheimer’s Association provides fantastic resources to guide caregivers throughout the various stages and symptoms of Alzheimer’s. Dealing with the early stages of memory loss can be confronting for someone with the disease.

The Association provides the following guidance for carers:

  • Clarify memory lapses simply and briefly so as not to overwhelm and offer corrections as suggestions – for example, “I think she is your granddaughter Julie.”
  • Show photos and other thought-provoking items.
  • Travel with the person to where he or she is in time.

Vascular Dementia

Vascular dementia is a broad term which is used to describe dementia that’s associated with blood circulation to the brain. There are a number of types of vascular dementia, but together they represent the second most common cause of dementia. Multi Infarct dementia (the most common type of vascular dementia) is caused by a series of strokes which damage the cortex of the brain (the area associated with learning, memory and language). It can also cause depression, mood swings and epilepsy – however an individual with vascular dementia is likely to retain parts of their personality for longer than someone with Alzheimer’s, for example. Binswanger’s Disease, another common type, can cause slowness and lethargy, difficulty walking, emotional ups and downs and lack of bladder control early on. Because the damage is caused by strokes, you might notice the progression of dementia in stages, with a period of stability between.

Smoking, high blood pressure and cholesterol and diabetes can be risk factors associated with this disease. According to Alzheimer’s UK, if the underlying cardiovascular diseases that have caused vascular dementia can be controlled, it may be possible to slow down the progression of the dementia. If possible, some form of exercise and a diet with plenty of fruit, vegetables and oily fish but not too much fat or salt will be beneficial.

If a person has physical difficulties following a stroke, rehabilitation with a physiotherapist, OT or speech therapist can assist. Talking therapies such as CBT can also assist with anxiety or depression.

Lewy Body Disease

This cause of dementia shares many symptoms with Alzheimer’s, and caused by the degeneration of nerve cells in the brain. The symptoms of Lewy Body disease can include confusion, difficulty with concentration and attention and difficulties judging distances, often resulting in falls.
Visual hallucinations, tremors and stiffness similar to that seen in Parkinson’s disease and fluctuation in mental state can also occur – and two of these must be present to reach a diagnosis.

It is particularly difficult to diagnose, however it is generally agreed that early diagnosis of the condition makes it easier for families to plan and improve quality of life for people with LBD. In this video from Dementia Australia, Robin, who has LBD, talks frankly about the condition and about the changing behaviours he experienced.

The Lewy Body Dementia Association has created a helpful chart describing the difference in symptoms between those with LBD and Alzheimer’s or Parkinson’s disease dementia.

Frontotemporal Dementia

Frontotemporal dementia or FTD is the name given to dementia when it is due to progressive damage to the frontal and/or temporal lobes of the brain. These are the areas that are associated with mood, social behaviour, attention, judgement and self control, as well as processing and understanding what we hear and see.

The symptoms can result in reduced intellectual abilities and changes in personality, emotional responses and behaviour, including increased impulsivity. Within this, there is a broad spectrum; some people can become apathetic, while others become disinhibited. Language and ability to recognise objects can also be impacted. This type of dementia does not cause memory loss, however individuals are likely to be unaware of how their behaviour affects them and those around them.

For family members, understanding FDT and why their loved one is behaving in certain ways can help with coping strategies to work around the behaviours. Adapting to behaviours, rather than trying to change them is the recommended approach. Speech therapy and an OT can also assist with communication and every day functioning.

While it can take time to make a diagnosis of dementia, a better understanding of what to expect can help families to plan for the right dementia support at each stage

Do you need some support for you or a loved one? You can search for and directly engage with independent care and support workers in your local area at

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