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Young onset dementia: different symptoms

Our specialist nurses explain the different symptoms that younger people with dementia may experience and share ideas and resources to help manage them.

The symptoms Symptoms of dementia differ from person to person, depending on the type of dementia and which parts of the brain it affects.

Memory issues are one of the most recognisable symptoms of dementia and include becoming forgetful and repetitive. However, these changes may not be obvious in the early stages for younger people, and as a result, the signs of dementia may be missed or mistakenly attributed to other conditions such as stress, anxiety, depression and menopause.

More commonly, people with young onset dementia experience early changes in:

  • behaviour and personality
  • language and communication
  • movement and coordination
  • social and life skills
  • vision and spatial awareness

Dementia causes changes to a person’s behaviour and personality. These changes are especially common if there is damage to the frontal and temporal lobes of the brain – for example in frontotemporal dementia.

Symptoms and changes may include:

Emotional changes

  • reduced empathy and emotional engagement
  • becoming irritable or anxious
  • becoming withdrawn or suspicious of others
  • mood changes, eg becoming depressed
  • becoming isolated and less engaged with family life


  • irrational and out of character decision-making
  • being secretive
  • developing new habits or activities that are out of character
  • change in sense of humour
  • difficulties coping with change


  • apathy or lack of energy
  • obsessive, compulsive or impulsive behaviour
  • changes in libido or sexual disinhibition
  • becoming verbally or physically aggressive
  • decline in personal routines and hygiene standards

Changes in behaviour and personality in someone with young onset dementia will increase over time, but the person may be unaware of these changes and their consequences. This can be difficult for family members, friends and colleagues to cope with – particularly children.

Difficulties with language or speech, known as aphasia, may occur in all forms of dementia.

Signs of aphasia include:

  • word-finding difficulties – speaking less fluently; reduced vocabulary
  • laboured, hesitant speech – not being able to get the right word out
  • vague or over-detailed speech – failing to get to the point; using the wrong words for objects
  • slurred speech
  • reduced communication – writing, reading or speaking less
  • avoiding correspondence such as emails, post or answering the phone
  • changes in handwriting – becoming difficult to decipher; writing more slowly

These changes are often first recognised by work colleagues, but they may attribute them to a cause other than dementia.

Communication difficulties can lead to a lack of confidence, connection and interaction with others. Speech and language therapy may help to improve a person’s speech.

Using smart phones, tablets and virtual assistant devices such as an Alexa to call or message friends and family can be useful in the early- to mid-stages of dementia. Assistive technology and apps may help the person to read and communicate.

Over time, dementia may lead to changes in a person’s movement and physical skills – particularly in Lewy body dementia and Parkinson’s. Common symptoms include:

  • changes in gait – shuffling; slower walking speed; shorter strides
  • issues with balance – falling, tripping
  • clumsiness – bumping into things
  • involuntary movement such as hand tremors or fixed eye movements
  • loss of dexterity and mobility
  • difficulty judging distances

Younger people with dementia may be physically fit and active. Activities such as walking, running, swimming, cycling or gentler exercise such as Pilates or yoga can help to maintain or improve a person’s movement by building their core strength, flexibility and balance. Physiotherapy can also be useful.

Over time, dementia will cause a general decline in a person’s social and life skills, including:

  • problems with literacy, numeracy and other basic skills
  • struggling to complete tasks or meet deadlines at work
  • a deterioration in driving ability
  • being unable to plan ahead
  • impaired judgement
  • being unable to recall things, regardless of their significance
  • becoming less willing to socialise or go out

It is important that a person with dementia is helped to maintain their work and social life, carry out everyday tasks and remain independent for as long as possible. Simple adjustments sometimes make a big difference. If the person works, adjustments in the workplace can make things easier and enable them to continue to work for longer.

Changes in visual perception and spatial awareness are particularly common in some types of dementia, including posterior cortical atrophy and Lewy body dementia.

These changes are often not related to the eye itself, but to the brain’s interpretation of what the eye sees. The person may make repeated visits to the optician but find nothing wrong.

Common symptoms include:

  • issues with perception and spatial awareness – mis-reaching for objects in clear view; difficulty perceiving depth and volume
  • hallucinations, particularly in Lewy body dementia
  • words appearing to float off the page when reading
  • difficulties seeing what things are and where
  • problems judging distances or seeing objects, particularly when driving

The symptoms of dementia will change and the person’s abilities will deteriorate over time. You can prepare for the future by reading up about their particular type of dementia and being aware of possible symptoms and scenarios that may occur.

Sharing the news of the person’s dementia and the way it affects them with family members, friends, work colleagues and neighbours can help them be more understanding and offer support.

If you have been diagnosed with dementia yourself, it is natural to be fearful about how your condition will affect you in the future. Your symptoms will change and your abilities decline over time, so it is important that you are well supported.

Changes in symptoms or new symptoms are a normal part of the progression of dementia, but if you have any concerns or need support, please speak to your GP or specialist, or contact our specialist dementia nurses.

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