1. What is Dementia?

Key points

Dementia causes damage to the brain, affecting people’s ability to remember, think and communicate.
There are over 100 different dementias with four common types:
- Alzheimer’s disease.
- Vascular dementia.
- Lewy body dementia.
- Frontotemporal dementia.
The impact of dementia on each person is different and can vary on a daily basis.
Everyone with dementia has different care needs and these needs might vary from day to day.

Dementia: an overview

Dementia refers to a range of conditions that damage parts of the brain, affecting behaviour and memory. It usually gets worse over time. Changes can be gradual and take place over several years. Or people can decline quickly over a few months, with sudden changes to behaviour and mental ability. Caring needs for a person with dementia have to be led by the changes you see in your client.

Many people don’t like to talk about dementia or ask for help. Your client and/or their family may refer to memory issues or forgetfulness, rather than dementia, so it’s helpful to listen out for their choice of language and reflect it back. The World Health Organisation has reported very low rates of dementia diagnosis worldwide and some cultures don’t have a word for dementia, which can lead to myths and misunderstanding. It is important to raise awareness about the condition and how it might affect the person.

Common dementias and their main differences

There is a lot of overlap between the symptoms and impact of the various types of dementia, particularly as the disease progresses. The symptoms and effects below are some examples of common things you may observe, and are not limited to the dementia type they are listed under.

We don’t know exactly how different types of dementia affect a person’s ability to remain continent.

Dementia type	Characteristics	Symptoms	Effect
Alzheimer’s disease	Abnormal structures called tangles and plaques build up in the brain	Memory loss Forgetfulness and confusion regarding familiar things Becoming withdrawn or having mood swings	Difficulty with recall of events and learning new information Getting lost in familiar places Problems with language Getting muddled
Vascular dementia	Problems with blood supply to the brain. May follow a stroke or a series of mini-strokes – also called TIAs (transient ischaemic attacks)	Difficulty planning, thinking quickly or concentrating Becoming withdrawn Memory loss Increasing communication difficulty	May become depressed or anxious May become confused for short periods Unsteady walking Reduced ability to self-care
Lewy body dementia (Parkinson’s dementia is very similar)	Small clumps of protein (called Lewy bodies) form inside nerve cells in the brain, affecting how the brain works	Difficulty with staying alert, planning ahead, reasoning and solving problems Disturbed sleep patterns Symptoms typically vary a lot from day to day	May find it hard to judge distances Difficulty seeing objects in 3-D May have visual hallucinations May develop problems balancing, slow and rigid movements or trembling of limbs
Frontotemporal dementia	Develops usually in people in their 40s – 60s, due to damage in the frontal and temporal lobes of the brain	Behavioural and personality changes May have problems with speech and understanding Loss of ability to demonstrate basic emotions	May become withdrawn or uncaring towards others May behave inappropriately in social situations May become impulsive May lose ability to speak, or getting words out Do not understand the meaning of words
Mixed dementia	More than one type of dementia is present; this is usually a combination of Alzheimer’s and vascular dementia, or Alzheimer’s and Lewy body dementia	Symptoms and their effects from both types of dementia are likely to be present.