Delirium: recognition and urgency

Key points

Delirium is a sudden change in mental state over hours to days—it is a medical emergency, not just 'worse dementia.'
The three types are hyperactive (agitated), hypoactive (sleepy/withdrawn), and mixed. Both are urgent.
Common causes: infections (especially UTI), medication side effects, dehydration, constipation, low oxygen, or metabolic issues.
Do not wait. Call the doctor or go to the ER. Tell them: 'This is a sudden change from baseline. I suspect delirium.'
Keep your loved one safe, calm, and oriented. Use simple phrases, a clock, and familiar objects.
Delirium is often reversible if the cause is treated quickly. Untreated, it can lead to falls, pneumonia, and permanent decline.

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

Notice the sudden change: Did this confusion or behavior change appear over hours or a day or two? Compare to their usual dementia baseline—this is a dramatic shift, not a gradual decline. Look for trouble focusing, disorganized thinking, and fluctuating symptoms.
Look for possible causes: new medications, a fall, signs of infection, dehydration, constipation, or a change in environment.
Call their primary care doctor or go to the emergency room immediately. Tell the medical team: 'My loved one has dementia, but this is a sudden change. I am worried about delirium.' Describe a clear timeline and bring a list of all medications with dosages.
While waiting, keep them safe: stay with them, remove tripping hazards, speak calmly using their name, and reassure them. Do not argue with hallucinations—validate the feeling.
In the hospital, advocate for orientation aids (clock, calendar, familiar objects). Encourage eating and drinking, ask about minimizing sedating medications, and remind staff this is a change from baseline.
After the acute episode, monitor for lingering effects and follow up with a doctor. Consider a referral to a geriatrician or neurologist.
Work to prevent future episodes: ask the doctor to review medications for delirium risk, address sensory deficits, and stay vigilant about hydration, infections, and constipation.

Do not assume it is just the dementia getting worse. Delirium is treatable; dismissing it misses the chance to fix the underlying problem.
Do not manage severe agitation or hallucinations at home without medical help. Delaying care risks falls, injuries, or worsening delirium.
Do not use restraints or raise your voice. Use a calm tone and simple one-step instructions.
Do not give sedatives or antipsychotics without a doctor's guidance; they can worsen delirium or mask symptoms.
Do not leave them alone. They may wander, fall, or become more frightened.

Sudden Change Checklist
When you notice a change, ask: (1) Did this start in hours or days? (2) Is their attention worse? (3) Are they more sleepy or agitated? (4) New medication? (5) Fever or pain? (6) Low fluid intake? If 'yes' to #1 and any other, call the doctor.
Reassuring Phrases for Delirium
Say: 'I am here with you. You are safe.' 'Let us sit down together.' 'I see you are worried. I will help.' 'It is daytime now. The clock says 2 p.m.' Validate the feeling, not the hallucination.
Medication List Template
Keep a current list of all prescription drugs, OTC meds, vitamins, and supplements with name, dose, frequency, and start date. Bring to every doctor visit and ER trip.
Orientation Kit
Pack: a large-print clock, a calendar with today circled, a familiar photo, a favorite blanket or pillow, and a notepad for questions. These reduce confusion.
Doctor Communication Script
Say: 'My [relative] has dementia, but this is a sudden change. They were fine yesterday. Now they are [describe behavior]. I am worried about delirium. Can you check for infection, medication side effects, and dehydration?'
Hydration & Nutrition Tracker
Use a simple chart to track daily fluid and food intake. Dehydration is a common delirium cause. Aim for 6-8 cups of fluid (unless restricted). Mark intake to show the doctor if it drops.

Ask your doctor: 'Could any of my loved one's current medications be contributing to delirium risk? Should we review them?'

Ask: 'If my loved one develops delirium, what is the safest way to manage agitation at home before we get to the hospital?'

Ask: 'Are there any lab tests (like a urinalysis or blood work) we should do routinely to catch infections early?'

Ask: 'My loved one has dementia and is going into the hospital for surgery. What can we do to prevent delirium?'

Ask: 'If antipsychotics are needed for safety, what is the lowest dose and shortest duration we can use?'