Sudden confusion in older adults (delirium): signs, causes and what to do

If an older relative suddenly, over a few hours or days, becomes muddled about time and place, talks nonsense, becomes very drowsy or, conversely, very agitated, do not dismiss it as “old age” or “the dementia getting worse”. This may be delirium: a sign of an underlying health problem that is usually treatable and needs prompt medical assessment.

Delirium versus dementia

• Onset: delirium develops over hours or days, dementia over months or years.
• Fluctuation: in delirium, good and bad spells alternate quickly through the day and it can be worse in the evening.
• Attention: in delirium the person cannot focus or follow a conversation.
• Delirium is more common in people with dementia, and “different from usual” is the most important clue.

Common causes

• Infections: urinary, chest or skin infections (even without a fever)
• Dehydration and electrolyte imbalances
• New medicines or dose changes, especially for sleep, pain and allergies
• Constipation, urinary retention, uncontrolled pain
• Surgery, hospital admission, lack of sleep, a change of surroundings
• High or low blood sugar, low oxygen levels

What should you do?

For sudden-onset confusion, contact a doctor the same day. If they are very drowsy or cannot be woken, or there is breathlessness, chest pain, high fever, a drooping face, weakness in an arm or leg, slurred speech or a head injury after a fall, call your local emergency number (112 in Türkiye and across the EU). Tell the medical team what they are normally like, when the change began and which medicines changed recently; the family’s knowledge is invaluable for diagnosis.

Surroundings that support recovery

• Make sure glasses, hearing aids and dentures are in.
• A visible clock and calendar; gentle reminders of the date and place through the day.
• Curtains open and a bright room by day; quiet and dim at night.
• Familiar faces, family photos, favourite music.
• Enough fluids, regular toilet trips and getting out of bed when possible.
• Do not argue or insist on correcting them; reassure with calm, short sentences.

Reducing delirium risk in hospital

When an older relative is admitted, stay with them where possible, bring their glasses and hearing aids, and give the team the home medicine list and a description of their usual mental state. Recovery can take weeks even after delirium settles; ask about the follow-up plan at discharge.