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Delirium
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Mental Health Behavior

Delirium

Delirium is a sudden, often temporary state of confusion and disorientation that can be triggered by various medical conditions or environmental factors.

What is delirium?

Delirium is a mental state characterized by confusion, disorientation, and an inability to think or remember clearly. It usually starts suddenly and is often treatable. There are three types:

  • Hypoactive: Feeling sleepy, tired, or depressed.
  • Hyperactive: Feeling restless or agitated.
  • Mixed: Changing back and forth between hypoactive and hyperactive states.

Causes and Risk Factors

Common causes include advanced cancer, alcohol or drug intoxication/withdrawal, dehydration, dementia, hospitalization, infections, medications, organ failure, and severe pain. Risk factors include older age, having multiple illnesses, surgery, and the use of certain mind-altering or pain medications.

Symptoms

Symptoms usually start over a few hours or days and often fluctuate. They include:

  • Changes in alertness and consciousness
  • Confusion and disorganized thinking
  • Disrupted sleep patterns
  • Emotional changes (anger, agitation, depression)
  • Hallucinations and delusions
  • Memory problems and trouble concentrating

Diagnosis

Providers diagnose delirium using medical history, physical and neurological exams, mental status testing, and lab or imaging tests. It is important to distinguish delirium from dementia: delirium starts suddenly and fluctuates, whereas dementia develops slowly, primarily involves memory loss, and is generally permanent.

Treatment and Prevention

Treatment focuses on identifying and addressing the underlying cause. Management strategies include:

  • Controlling the environment (quiet, well-lit rooms with clocks or calendars).
  • Using medications to manage aggression, agitation, or pain.
  • Ensuring the use of assistive devices like hearing aids or glasses.

Prevention involves treating underlying conditions, avoiding unnecessary sedatives, keeping hospital environments calm, and involving family members in care.

Frequently Asked Questions

First, alert the medical team immediately, as early intervention improves outcomes. While waiting for staff, help reduce environmental stressors by ensuring the room is quiet and well-lit, and that the patient has access to familiar items like glasses, hearing aids, or a family photo. Keep the patient oriented by calmly reminding them of the date, time, and location. Avoid arguing with any hallucinations or delusions; instead, validate their feelings and gently redirect their attention. Ensure they are hydrated and have used the bathroom, as physical discomfort can worsen agitation.
The duration of delirium varies widely depending on the underlying cause and the patient's baseline health. In some cases, symptoms may resolve within a few days to a week once the infection, medication, or metabolic imbalance is corrected. However, in older adults or those with pre-existing cognitive impairment, delirium can persist for weeks or even months. It is important to note that while the acute confusion may fade, some patients may experience lingering cognitive deficits, which is why follow-up cognitive assessments are recommended after recovery.
The key differentiator is the speed of onset and the fluctuating nature of symptoms. Delirium typically appears suddenly, often within hours or days, and the level of confusion may wax and wane throughout the day. In contrast, dementia is a chronic, progressive condition that develops slowly over months or years and generally does not fluctuate as dramatically from hour to hour. If a person who was previously clear-headed becomes acutely confused, disoriented, or agitated, it is a medical emergency that requires immediate evaluation to rule out delirium.
Yes, delirium is often preventable through non-pharmacological interventions. Key strategies include maintaining a regular sleep-wake cycle by keeping the room dark and quiet at night and bright during the day. Early mobilization, such as sitting in a chair or walking with assistance, is more effective than bed rest for maintaining cognitive function. Additionally, minimizing the use of unnecessary sedatives and physical restraints is crucial, as these factors significantly increase the risk of developing delirium.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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