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Dementia is used as an 'umbrella' term to describe the visible signs and symptoms that occur when the brain is affected by certain diseases or conditions. There are many different causes or sub-types of dementia. However, the majority of cases are due to the five most common causes of the condition. These are Alzheimer's disease, vascular dementia, dementia with Lewy bodies, mixed-dementia and frontotemporal dementia.

Understanding the specific cause or sub-type of dementia can be important as different types can be experienced and present with different signs, symptoms, rates and pattern of decline and challenges to manage and support. They can also indicate different treatments and interventions.

Below there are some brief descriptions to help you understand the different conditions or diagnosis you or the person you care for may have, with links to the Alzheimer's Society fact sheets which go into more detail.

Alzheimer's disease (AD): is the most common cause of dementia. Its onset and progression is gradual, usually presenting early with changes in memory. As the disease progresses throughout the brain the signs and symptoms become more widespread and severe affecting most areas of mental functioning. Whilst most people who experience AD are over 65 years of age, there is a rarer 'early onset' type of AD that can affect people before the age of 65 years of age.

Vascular dementia: can occur either suddenly, following a stroke, or over time, through a series of small or 'mini' strokes'. Due to this, in contrast to AD, it  can progress in a more 'step-wise' fashion with periods of stability followed by episodes of more sudden decline. As well as memory problems, depression, unsteadiness, and behaviour change can be common in vascular dementia.

Dementia with Lewy bodies (DLB): like AD has a gradual onset and decline but can commonly present with features similar to Parkinson's disease following the onset of memory problems. These can include tremors and unsteady walking and/or falls. Also, hallucinations (seeing things that are not there) especially of people and animals, and disturbed sleep are also more common in this form of dementia.

Frontotemporal dementia (FTD): is a relatively rare type of dementia where damage is usually focused in the front part of the brain. Due to this, memory is not also affected initially but instead changes to the person's personality and behaviour can be the first signs - such as becoming indifferent to others, uninhibited and not taking care of themselves. It can affect people at a younger age, with onset happening from around 55 years of age.

Mixed dementia: is becoming increasingly common and is when there is a mixture of both Alzheimer's disease and vascular dementia changes occurring in the brain, both of which contribute to changes in memory, thinking and behaviour.

Progression of dementia

Whatever type of dementia you or the person you care for has, it is progressive. Meaning that the structure and chemistry of the brain become increasingly damaged over time. Depending on your own circumstances and particular diagnosis, dementia and how it progresses differs between person to person. If you can view the progression of dementia as a series of stages it can be useful in helping you to understand the illness, but keep in mind that these stages will differ on an individual basis.

Useful Contacts

Dementia UK provide a free Admiral Nurse Dementia Expert Helpline for anyone with a question or concern about dementia.

Helpline: 0800 888 6678

Website: https://www.dementiauk.org/ 

Swindon Carers Centre provide advice and support to carers.

Tel: 01793 531133

Website: https://www.swindoncarers.org.uk

Dementia Friends Information Sessions are free 45 minute sessions which provide those attending with an understanding of what dementia is and how it can affect a person. Dementia Friends Sessions take place across Swindon, to organise a session please visit:

For local information regarding dementia please visit:

Other Useful Contacts