Delirium & sudden confusion
If you or someone else has become confused suddenly, seek medical help now. This page explains delirium and care after help has been arranged; reading it should not delay assessment.
Delirium is an acute medical condition.
Delirium involves a rapid change in attention, thinking and awareness, often fluctuating over hours or days. Illness, medicine effects and other medical causes can contribute.
It can happen at any age and can occur alongside dementia. A person may be agitated, or unusually quiet and withdrawn. A quiet presentation is not a reason to delay care.
Based on MSD Manual Professional
Medical help comes before this explanation.
- Immediate care
Get help for a new sudden change
- Clinical assessment
Medical causes and urgent needs
- Treatment & support
Address the cause with professional care
- Recovery & review
Ask about ongoing needs and follow-up
Information that may help the medical team.
Get help first. You do not need to check for all of these, question the person repeatedly or perform an orientation test.
The timing
Explain when the sudden change began, if you know.
What changed
Describe what is different from the person’s usual way of communicating or functioning.
Health & medicines
Tell the team about recent illness and medicine changes, if known.
Variation
Mention whether alertness or confusion has varied while help is arranged.
Based on NHS · MSD Manual Professional
Assessment looks for the cause and immediate needs.
The medical team assesses the change, health, medicines and possible causes, with examination and relevant investigations. A clinical assessment cannot be replaced by a home score.
A supporter’s account may help explain what is different. Share what you know with the team; gathering a detailed history should not delay emergency help.
Based on MSD Manual Professional
- 1When it began
Tell the team the time or approximate change you noticed, if known.
- 2What is usual
Describe how the person normally communicates and manages their day.
- 3Relevant changes
Share known recent illness or medicines. Do not delay calling for help to gather this.
A sudden change needs help even if the person seems quiet.
Delirium may involve reduced attention and changing awareness, with a quiet or agitated presentation. It can occur alongside dementia and may fluctuate.
Get immediate medical help for new sudden confusion. In a hospital or care setting, alert staff immediately. Do not delay to complete a test, collect notes or wait for every possible symptom.
Based on NHS · MSD Manuals
Medical treatment and supportive care go together.
Explore the options and ask what fits your circumstances and needs.
Based on NHS · MSD Manual Professional
While help is arranged, keep communication calm.
Stay with the person if it is safe, offer simple reassurance and avoid repeated questioning. Share known health or medicine information with the medical team when it is available, without delaying help.
After treatment, ask about the cause, continuing symptoms and follow-up. Recovery varies; a general description cannot promise a particular timetable.
Based on NHS · MSD Manuals
You deserve to understand your care.
New sudden confusion needs immediate medical assessment.
Your clinical assessment
Find support. Prepare your next step.
Find care or prepare a conversation. You can ask for help before you have a diagnosis.
After medical help, clarify the next step.
Recovery varies and may take time. Before discharge or a change in care, ask who will review ongoing thinking difficulties and practical needs. New sudden confusion still needs immediate medical help.
Based on MSD Manual Professional
“There has been a sudden change in confusion or alertness. We need medical help; I can explain what is different from usual.”Return to medical help
Your questions, with room for nuance.
You can read just the answer you need.
Can delirium happen to someone who already has dementia?
Yes. A sudden change should receive immediate medical assessment rather than being assumed to be the usual dementia pattern.
Based on NHS · MSD Manuals
Where this information comes from.
Use this hub to learn and prepare questions. It does not diagnose you or recommend a personal treatment plan. By Selfmora editorial; sources checked . Updated .
Additional explanations and examples: sources consulted . Examples illustrate ideas; they do not assess your personal health. Your questions
Our editorial approach