Lewy Body Dementia: A Care Staff Guide to Symptoms and Support

Dementia with Lewy bodies, also called Lewy body dementia, is one of the most common types of dementia, according to the NHS. It is caused by protein clumps forming inside brain cells, and it develops slowly, getting worse over several years. For care and support staff, it matters because it can look very different from the memory-led picture many people expect from dementia.

This guide explains the main symptoms in plain language, how they can show up in a care setting, and how to support someone well. It sits alongside our wider material on dementia care training requirements, and it is general information rather than clinical advice.

What makes Lewy body dementia different

The NHS describes several features that help set Lewy body dementia apart. Problems with thinking, understanding, judgement, visual perception, language and memory are common, but they tend to come and go rather than staying constant. Significant memory loss may appear later in the condition.

The main symptoms staff may see

• Hallucinations. The NHS notes that people may see, or sometimes hear, things that are not there. These can range from pleasant to distressing.
• Fluctuating alertness. There can be marked swings between alertness and confusion or sleepiness. The NHS says these can happen unexpectedly and change over minutes or hours.
• Movement difficulties. Slow movement, stiff limbs, tremors and shuffling, similar to Parkinson's disease.
• Falls and unsteadiness. Fainting, unsteadiness and falls are listed as symptoms.
• Sleep changes. Talking in sleep, acting out dreams, or sleepiness during the day.
• Swallowing problems. Dysphagia can occur.
• Low mood and anxiety. Depression and anxiety are also common.

Why the day-to-day picture is hard to predict

Because alertness can change within hours, the same person may manage a task well in the morning and be unable to do it in the afternoon. This is not a sign of effort or attitude. It is part of the condition. Staff who compare one shift to the next can easily misread a good day as recovery, or a bad day as a sudden decline. Recording what you see, at what time, and what was happening around the person gives the wider team something concrete to work with.

Supporting someone with hallucinations

Hallucinations are not always distressing. If the person is calm and comfortable, there may be no need to challenge what they see. If they are frightened, stay calm, acknowledge the feeling rather than arguing about what is real, and check for things that can make hallucinations worse, such as poor lighting, shadows, reflections, pain, infection or tiredness. Report new or worsening hallucinations to the senior on duty, because sudden changes can have a treatable cause.

Falls, movement and swallowing

With stiffness, shuffling and unsteadiness, falls prevention is a core part of care. Clear walkways, good lighting, suitable footwear and help when standing up all matter. The NHS lists physiotherapy and occupational therapy among the therapies that can help with movement problems. Swallowing difficulties need prompt referral, because they can affect safe eating and drinking. Our guide to cognitive impairment after stroke covers related screening ideas.

Sleep and daytime sleepiness

Acting out dreams can disturb the person and other residents. Keep the person safe at night, avoid waking them abruptly if you can, and share what you see with the team. Daytime sleepiness may mean activities are better planned for when the person is most alert.

Medicines and distress

There is no cure for Lewy body dementia. The NHS says treatment focuses on managing symptoms, with medicines for problems such as hallucinations and movement difficulties, plus therapies such as physiotherapy and occupational therapy, and psychological approaches such as cognitive stimulation and memory cafes. Medicine decisions belong to the prescriber and specialist teams.

NICE's dementia guideline (NG97) is clear that distress should not be treated with medicine first. Check for causes such as pain, delirium or the environment, and offer psychosocial and environmental approaches. Antipsychotics should only be offered where someone is at risk of harming themselves or others, or has agitation, hallucinations or delusions causing severe distress, at the lowest effective dose and for the shortest time. For more on medicine review in care homes, see our guide to STOMP and antipsychotic medication review.

Capacity, consent and involving the person

Fluctuating alertness means capacity can vary over the day, so capacity is assessed for each decision at the time it needs to be made. Choose the time when the person is at their best, give information in a way they can follow, and record how you reached the decision. See our guide to Mental Capacity Act and DoLS training requirements for the legal framework.

Prognosis and planning ahead

The NHS gives average survival after diagnosis as around five to seven years, though outcomes vary considerably, and it notes that many people eventually need care home placement. Early conversations about wishes, preferences and future care, written into a person-centred care plan, make later decisions easier for the person, their family and the team.

Training for staff

NICE says all staff working with people living with dementia need foundation-level training in person-centred dementia care, with further training on responding to agitation, pain management and reducing antipsychotic use for those who need it. Condition-specific knowledge, such as an understanding of Lewy body dementia, helps teams respond to what they see. Browse our CPD courses to see what training is available for care teams.

Key points to remember

• Lewy body dementia often features hallucinations, fluctuating alertness, movement problems and sleep changes.
• Good and bad days are part of the condition. Record what you see and when.
• Look for causes of distress before assuming medicine is the answer.
• Assess capacity decision by decision, ideally when the person is most alert.
• Report new falls, swallowing problems or sudden changes promptly.

Sources

• NHS: Dementia with Lewy bodies, overview and symptoms (nhs.uk), accessed October 2026
• NICE guideline NG97: Dementia, assessment, management and support (nice.org.uk), accessed October 2026