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Delirium symptoms overview

Key points

  • Delirium is a sudden, dangerous change in mental state that requires immediate medical attention—do not assume it is just dementia.
  • The three types are hyperactive (agitated, hallucinations), hypoactive (quiet, withdrawn), and mixed; all are serious.
  • Common triggers include infections, medication changes, dehydration, surgery, and electrolyte imbalances.
  • Use calm reassurance, simple language, and familiar objects to reduce agitation; do not argue with hallucinations.
  • Bring a medication list and symptom log to the hospital to help doctors identify causes quickly.
  • Delirium is often reversible if caught early, but it can cause long-term cognitive decline if ignored.

General caregiving information, not medical advice. Check medications and major care changes with your clinician.

Step-by-step

  1. Recognize the change and check for common triggers: stay calm, note when the shift began, and write down symptoms (confusion, trouble speaking, restlessness, sleepiness, hallucinations, agitation). Then review recent changes: new medications or dose changes, signs of infection (fever, painful urination, cough), fluid intake, recent fall or surgery.

  2. Get medical help immediately: call their doctor or go to the ER. Say: 'I think my loved one has delirium. The change came on suddenly over [hours/days]. They have dementia, and this is different from their usual behavior.' Mention any recent medication changes, infections, or falls.

  3. Bring a complete list of all medications, supplements, and medical conditions: write names, doses, and when each was last changed.

  4. Create a calming environment: in the hospital, request a private room if possible. Bring familiar items (blanket, photos, large-number clock). Keep lights dim at night and bright during day. Minimize noise and interruptions.

  5. Stay present, speak gently, and watch for safety risks: use short, simple sentences. Say their name and offer reassurance ('You are safe. I am here.'). Monitor for falls, wandering, or pulled IV lines. If restless, try gentle hand-holding or a slow supervised walk instead of restraint.

  6. Support hydration and nutrition: offer small sips of water or clear fluids frequently. If not eating, ask the nurse about nutritional supplements.

  7. Follow up after the episode: ask the doctor for a plan to reduce future risk. Delirium increases the chance of future episodes and can accelerate cognitive decline.

What not to do

  • Don't assume a sudden change is just dementia worsening—delirium is a medical emergency that can cause permanent harm if untreated.

  • Don't argue with or correct hallucinations—validates feelings instead: 'I can see you are scared; I am here to keep you safe,' then redirect.

  • Don't give sedatives, sleep aids, or new medications without a doctor's order—drugs like benzodiazepines or antihistamines can worsen delirium.

  • Don't leave them alone in an unfamiliar environment—if you must step away, ask a nurse or family member to sit with them.

  • Don't physically restrain them—restraint increases agitation and can cause injury.

  • Don't overlook hypoactive delirium—if they become very quiet, sleepy, or withdrawn, check for other symptoms and seek help.

Practical tools

  • DELIRIUMS Acronym for Common Triggers

    D - Drugs (new meds, pain pills, antihistamines); E - Electrolyte imbalance (low sodium, dehydration); L - Lack of sleep or sensory deprivation; I - Infection (UTI, pneumonia); R - Respiratory or cardiac issues (low oxygen); I -

Discuss with your clinician

Ask the doctor: 'Could any of my loved one's current medications be causing or worsening delirium? Which ones should be stopped or changed?'

Ask the doctor: 'What is the safest way to manage agitation or hallucinations during delirium? Are there non-drug approaches we can try first?'

Ask the doctor: 'Should we screen for a urinary tract infection, even if there are no typical symptoms like fever or burning?'

Ask the doctor: 'After the delirium resolves, what follow-up tests or specialist referrals do you recommend to prevent future episodes?'

Ask the pharmacist: 'Are there any over-the-counter medications or supplements my loved one is taking that could interact with their prescriptions and cause confusion?'

Ask the doctor: 'If my loved one has Lewy body dementia, what medications should we absolutely avoid during a delirium episode?'

Related guides

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