Why sudden behavioural change in dementia should trigger consideration of delirium, pain and physical health before being labelled as BPSD.
This article provides general education for care providers. It does not replace assessment by the resident’s GP, community services, safeguarding team, mental capacity decision-maker, prescriber or emergency services where required. Resident-identifiable information should not be shared through website enquiries.
Why this matters
Delirium can be missed in care homes because the person already has cognitive impairment. If a sudden or fluctuating change is mislabelled as BPSD, physical illness, pain or medication effects may be missed or treatment may be delayed.
Delirium can be hyperactive, hypoactive or mixed
- Hyperactive delirium: agitation, restlessness, distress, hallucinations or aggression.
- Hypoactive delirium: drowsiness, withdrawal, reduced mobility, slower responses, reduced intake or appearing “quietly worse”.
- Mixed delirium: fluctuation between hyperactive and hypoactive features.
Hypoactive delirium is particularly easy to miss because it may not create obvious disruption for staff.
Features that should raise concern
- Sudden change over hours or days
- Fluctuating confusion, attention or alertness
- New or worsened hallucinations, paranoia or distress
- Reduced intake, mobility, continence or communication
- Recent fall, infection, constipation, dehydration or medication change
- Behaviour that is clearly different from the resident’s usual baseline
BPSD is usually more patterned
Behavioural and psychological symptoms of dementia can fluctuate, but there is often a more established pattern over time. Delirium often feels like a sharper change from baseline and should prompt timely clinical consideration.
Care home checklist
- Know and document the resident’s usual baseline
- Record onset, fluctuation and associated physical signs
- Check pain, bowels, hydration, sleep and recent medicines changes
- Escalate sudden change through the appropriate clinical route
- Avoid relying only on behaviour charts when physical health has changed
Mini case example
A resident with dementia became suddenly more aggressive and was thought to be “deteriorating”. Staff review showed new drowsiness between episodes, reduced fluid intake and a recent fall. The key issue was not simply BPSD, it was a sudden change requiring physical health escalation.
Sources and UK guidance basis
- NICE CG103, delirium prevention, diagnosis and management in hospital and long-term care.
- NICE NG97, dementia guidance, including assessment of pain and physical health needs.
- NICE QS184, distress in dementia and considering delirium, pain and inappropriate care.
What this article cannot do
General articles can help teams think more clearly, but repeated incidents, safeguarding concerns, placement instability, complex family dynamics, prescribing questions or restrictive practice need case-specific review by the appropriate accountable professionals.
First Response Dementia Services provides focused dementia behaviour review, formulation and practical care planning support for care providers. The aim is to help teams understand the pattern, strengthen documentation and agree realistic next steps.