Psychiatry, conditions

Sudden confusion or delirium: when urgent medical care matters

Sudden confusion is a medical emergency. If someone suddenly becomes confused, call 112 or go to the nearest emergency department now. Do not wait for a routine appointment.

Need help now?

Get help now if someone becomes confused over hours or days. Some causes can be life threatening. Signs include:

  • suddenly not thinking or speaking clearly, or not knowing where they are
  • suddenly being much sleepier, quieter or slower to respond than usual
  • seeing or hearing things that are not there
  • not being able to say their name, their age or today's date

Call 112 or go to the nearest emergency department. See crisis lines.

In short

  • Sudden confusion needs emergency medical care now, because some causes can be life threatening.
  • Delirium can look like agitation, or like unusual quietness and sleepiness.
  • Tell the medical team what the person is usually like and when the change began.

What should I do while we wait for help?

Stay with the person, and bring their medicines or a list of them if you can do so without delay. Many causes of sudden confusion need treatment quickly. Do not try to work out the cause yourself.

While you wait for help:

  • tell them who you are and where they are, and keep reassuring them
  • use simple words and short sentences
  • do not ask lots of questions
  • do not stop them moving around, unless they are in danger
  • do not give any sleeping tablet or calming medicine unless a doctor tells you to

What is delirium?

Delirium is a sudden change in thinking and attention, over hours or days. A person may not think or speak clearly. They may not know where they are.

They may struggle to pay attention or remember things. Some see or hear things that are not there.

The confusion often comes and goes during the day. A quick check is to ask their name, their age and today's date. If they seem unsure or cannot answer, call 112 or go to the nearest emergency department.

A caregiver and clinician discussing a sudden change with an older adult present.
Sudden confusion needs emergency medical care now. Tell the team what changed and when.

Can a quiet, sleepy change be delirium?

Yes. Delirium does not always look like agitation. Some people become withdrawn, slow to respond, sleepy and less interested in food. This quiet kind is often missed.

A person who already has dementia can also get delirium. So a sudden change in someone with dementia still needs emergency medical care now.

Slow forgetfulness over months is different. It needs a doctor's visit, but it is not usually an emergency.

What can cause sudden confusion?

Many things can, and doctors need to find the cause. Common causes include:

  • an infection, such as a urine infection
  • a stroke
  • low blood sugar in a person with diabetes
  • a head injury
  • some prescription medicines
  • alcohol, alcohol withdrawal, or drugs
  • breathing or heart problems
  • some kinds of seizures

Often more than one cause is involved. Treatment focuses on finding and treating the causes.

A person bringing a question to a consultation.
Bring a current medicine list to the treating team. Do not delay urgent assessment while gathering records.

How can family help at the hospital?

Tell the team what the person is usually like and exactly when the change started. Mention any recent illness, falls, new medicines, alcohol or drugs.

A familiar face can help the person feel calmer and less lost. Gently remind them where they are and who you are. Make sure they have their glasses and hearing aids, if they use them.

An adult talking with family members who are listening.
Explain known wishes and useful observations to the treating team. Ask about the family's role while urgent assessment proceeds.

Does the person still get a say?

Yes. The person should still get explanations they can follow. Short, clear words help. You can ask the team what they are doing, why, and when it will be reviewed.

If you know what matters to the person, tell the team. Your view helps, but it does not replace the medical assessment.

A person explaining what matters to them while a clinician listens.
Explanations still matter during a crisis. Ask what is being done and why.

What happens after the episode?

Delirium is common and often temporary, but follow-up with the person's own doctors matters. Before leaving hospital, ask:

  • what caused the delirium
  • which medicines were changed or stopped
  • what signs to watch for
  • who to contact if the confusion comes back

If the confusion does not clear, their doctors can look again for causes and may check memory later.

Some people remember the confusion and find it upsetting. Talking about it with their doctor can help.

An older person and caregiver reviewing a follow-up plan with a clinician.
After the episode, ask about causes, medicine changes and follow-up with the person's own doctors.

Questions to bring

  • What was the person like before, and when exactly did this change?
  • What possible causes are being checked?
  • Which medicines were changed, and why?
  • What should we watch for at home, and who do we call?
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