What Is Dementia and Is It Genetic? Causes, Symptoms and Family Risk Explained

Dementia is a broad term used to describe a collection of symptoms caused by disorders affecting the brain. It is not a single disease in itself, and importantly, it is not a normal part of ageing. While research shows that genetics can play a role in certain types of dementia, for most people, family history is just one of many factors that influence risk. 

Understanding the signs and symptoms of dementia is the first step toward finding the right support and living a social, connected life. 

Key Takeaways 

  • Broad Symptom Umbrella: Dementia describes a range of symptoms affecting memory, thinking, and social abilities, caused by various underlying brain disorders. 
  • Risk vs. Certainty in Genetics: Most cases of dementia involve “risk-factor genes” that increase the likelihood of the condition rather than “certainty genes” that guarantee it. 
  • Support for Younger Onset: Dementia can affect people under the age of 65, and tailored NDIS support is available to help maintain routines and community connection. 
  • Specialised SIL in Ryde: Supported Independent Living (SIL) at our Ryde 2 property provides 24-hour care specifically designed for NDIS participants with dementia, focusing on self-reliance and familiar daily structures. 

What is dementia? 

Dementia is not one specific disease. Instead, it is a “syndrome,” a group of related symptoms that occur when the brain is damaged by specific diseases or conditions. According to Dementia Australia, dementia affects thinking, behaviour, and the ability to perform everyday tasks. 

There are over 100 different causes of dementia, but the most common include: 

  • Alzheimer’s disease: The most frequent cause, involving the buildup of proteins in the brain. 
  • Vascular dementia: Caused by problems with blood supply to the brain, such as after a stroke. 
  • Lewy body disease: Linked to abnormal deposits of protein inside nerve cells. 

What are the common symptoms of dementia? 

Dementia affects everyone differently depending on which part of the brain is impacted. However, common symptoms often include: 

  • Memory loss: Specifically forgetting recent events or conversations. 
  • Mental clarity: Difficulty planning, problem-solving, or following a complex sequence of instructions. 
  • Communication issues: Struggling to find the right words or follow a conversation. 
  • Behavioural changes: Shifts in mood, personality, or social engagement. 

Is dementia genetic? 

This is a complex question with a nuanced answer. While some forms of dementia have a genetic component, they are relatively rare.  

In scientific terms, researchers distinguish between two types of genes: 

  1. Risk-factor genes: These are common. Having them increases the chance of developing dementia, but it does not make it a certainty. Many people with these genes never develop the condition. 
  1. Certainty genes: These are very rare. If a person inherits one of these specific gene mutations, they will almost certainly develop dementia, usually at a much younger age. 

Does dementia run in families? 

It is natural to worry if a parent or grandparent had dementia. While having a close relative with the condition can slightly increase your risk, for the vast majority of people, dementia is caused by a mix of age, lifestyle, environmental factors, and genetics working together. 

Even in families where dementia seems common, it does not automatically mean every member will be affected. Modern research focuses on how we can build “brain health” through social connection and physical activity to mitigate some of these genetic predispositions. 

Is younger onset dementia different? 

When dementia is diagnosed in someone under the age of 65, it is referred to as younger onset dementia. Because this affects people who may still be working or raising a family, the support needs are often quite different from those of older adults. 

For younger people living with dementia, the focus is often on maintaining self-reliance and staying involved in the local community. This is where the NDIS can play a vital role, providing funding for home and living supports that are tailored to the individual’s specific stage of life. 

Dementia support and accommodation options 

When symptoms begin to affect safety or daily routines at home, families often look for specialized living arrangements. It is important to find an environment that feels like a home, not a facility. 

At Unisson Disability, our Ryde 2 dementia support accommodation is designed specifically for NDIS participants with dementia. This property offers: 

  • 24-hour tailored care: Support workers who understand the importance of routines and personal preferences. 
  • Safety and comfort: A single-storey layout with a secure backyard, located close to medical centres and community hubs. 

When should you seek support? 

Navigating a dementia diagnosis can be overwhelming for the whole family. If you are unsure about your next steps or how to access funding, a Home and Living Assessment can help determine exactly what level of care is required to stay safe and supported. 

Our Support Coordination team is also available to help you understand your NDIS plan and connect with the right services, from social groups to current disability accommodation vacancies

Exploring your future with Unisson 

At the end of the day, a diagnosis doesn’t change a person’s value or their need for connection. Whether you are looking for advice on supported accommodation or simply want to learn more about our disability services, we are here to walk with you. 

If you are ready to see what’s possible, contact our team today to learn how we can support your journey. 

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