Dementia Hallucinations: What to Do When Your Parent Sees Things That Aren't There

Why Hallucinations Happen in Dementia

Hallucinations — seeing, hearing, or feeling things that are not there — occur in many types of dementia, but they are not all the same. In Alzheimer's disease, hallucinations tend to appear in the middle to late stages as the brain's ability to process sensory information deteriorates. In Lewy body dementia, vivid visual hallucinations are often one of the earliest symptoms, sometimes appearing before significant memory loss. In vascular dementia, hallucinations are less common but can be triggered by mini-strokes affecting specific brain regions.

Understanding the type matters because it changes the treatment approach. Lewy body hallucinations respond particularly badly to typical antipsychotics like haloperidol — these drugs can cause severe, potentially fatal neuroleptic sensitivity reactions. A GP who does not know the specific dementia subtype may prescribe the wrong medication.

When Hallucinations Are Distressing vs. When They Are Not

Not all hallucinations require intervention. Some people with dementia see children playing in the room or a familiar pet sitting on the sofa. If these experiences are not causing distress or dangerous behaviour, the clinical guidance is to leave them alone. Challenging the hallucination — "There is no cat there, Mum" — can cause confusion, agitation, and a breakdown in trust.

Intervene when the hallucination causes:

• Fear or distress. Your parent believes intruders are in the house, or that insects are crawling on them.
• Aggression. They lash out because they perceive a threat that feels entirely real.
• Unsafe behaviour. They try to leave the house to escape what they are seeing, or refuse to enter a room.
• Refusal of care. They will not let you help with washing or dressing because they believe a stranger is watching.

What to Do in the Moment

Stay calm and speak slowly. Your parent's emotional state will mirror yours. If you are visibly frightened or frustrated, they will escalate.

Acknowledge their experience without confirming it. "That sounds really frightening" validates the emotion without pretending the hallucination is real. Avoid saying "I can see it too" — if they later realise you lied, it damages trust.

Check the environment. Shadows, reflections in mirrors or TV screens, patterned wallpaper, and poor lighting are common triggers. A coat hanging on a door can look like a person. A dark patch on the carpet can look like a hole. Simple changes — removing mirrors from the bedroom, using plain-coloured bedding, keeping rooms well-lit — reduce the visual triggers that the brain misinterprets.

Redirect gently. Move to a different room, offer a cup of tea, put on familiar music. The goal is to shift their attention away from the hallucination without a confrontation.

When to Contact the GP

Call the GP surgery if hallucinations are new, suddenly worse, or accompanied by other changes like fever, confusion beyond their baseline, falls, or reduced fluid intake. A urinary tract infection (UTI) is one of the most common causes of sudden-onset hallucinations in older adults — and it is treatable. Dehydration, constipation, and medication side effects are other reversible triggers.

Request a medication review. Some drugs prescribed for other conditions — certain blood pressure medications, painkillers, and bladder medications — can worsen hallucinations. The GP should check whether any current prescriptions are contributing.

If your parent has Lewy body dementia and the hallucinations are severely distressing, a low-dose atypical antipsychotic like quetiapine may be considered with specialist guidance — using the lowest effective dose for the shortest possible time.

How Hallucinations Affect NHS Continuing Healthcare Eligibility

Severe hallucinations and the behavioural responses they trigger — aggression, wandering, resistance to care — are directly relevant to the NHS CHC assessment. The Decision Support Tool scores cognition, behaviour, and psychological/emotional needs as separate domains. A parent who experiences regular distressing hallucinations that require professional intervention and cannot be safely managed by family alone may score "High" or "Severe" on the behaviour and psychological domains.

Two or more "Severe" domain scores can strongly indicate a primary health need, but they do not guarantee CHC: the MDT considers the totality of needs, and the Severe level is not available in every domain.

If your parent's hallucinations are escalating, start keeping a daily log of episodes — time, duration, what they saw or heard, how they responded, and what you did. This evidence is exactly what the multidisciplinary team reviews during the DST assessment.

Our Dementia Care in England guide includes a daily care diary template designed for this purpose, along with the CHC evidence tracker that maps symptoms to the specific clinical domains.

See more England guides →