• Delirium


    Delirium is a change in mental status. Delirium is marked by extreme, fluctuating changes, including:
    • Changes in perception and sensation
    • Difficulties with ability to:
      • Focus
      • Sustain and shift attention
      • Think and reason rationally
      • Function normally
      • Communicate clearly


    Hundreds of underlying causes can result in delirium. Some of the most common causes include:
    Brain Tumor
    Brain Tumor
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    Risk Factors

    Factors that may increase your risk of developing delirium include:
    • Terminal illness, especially just before death
    • Serious illness, such as AIDS
    • Increased age
    • Severe sleep deprivation
    • Severe burn
    • Central nervous system problems such as stroke, seizures, tumors, and dementia
    • Surgery
    • Hospitalization
    • Visual or hearing impairment
    • Immobility
    • Dehydration
    • Severe constipation
    • Memory impairment
    • Deficiency in certain vitamins


    Symptoms usually come on quickly and can last for days, weeks, or longer. They also vary in severity depending on the cause. Symptoms are often worse at night and may include:
    • Inability to pay attention
    • Confusion
    • Memory problems
    • Language disturbances
    • Disorientation, especially about:
      • Time of day
      • Where one is
      • Who one is
    Severe symptoms include:
    • Misinterpretations—for example, thinking a doctor who is trying to help you is trying to hurt you
    • Illusions—for example, thinking someone is someone else
    • Hallucinations—seeing, hearing, or feeling things that are not there
    • Emotional disturbances—for example, suddenly becoming angry, fearful, or withdrawn for no apparent reason


    You will be asked about your symptoms and medical history. A physical exam will be done. The doctor will ask specific questions about:
    • Present injury or illness
    • Use of medications or illicit drugs
    • Time when mental state changed
    • How and how fast the mental state changed
    The diagnosis will be made based on what the doctor finds during the exam. To determine a cause your doctor may need to run several tests:
    • Blood tests
    • Urine tests
    • Lumbar puncture
    • Kidney and liver function tests
    • Thyroid function tests
    Images of internal organs may also help to determine a cause. Images may be taken with:
    Electrical activity of the heart and brain can be tested with electrocardiogram (EKG) and electroencephalogram (EEG).


    Delirium is first treated by identifying and treating the underlying cause. Then, symptoms are treated through medication, psychological management, and environmental and supportive interventions.
    Treatments may include:


    Drugs used to treat symptoms of delirium include:
    • High-potency antipsychotic medications
    • Benzodiazepines—used to treat delirium caused by alcohol withdrawal
    • Cholinergic medications—used to treat delirium caused by anticholinergic medications, which are used to treat stomach cramps and spasms in the intestines and bladder, among other conditions
    • Vitamins—given if the delirium is caused by low levels of vitamins
    If you are taking medication that is worsening your confusion, you may be asked to stop these.

    Psychological Management

    Psychological therapy may help you:
    • Feel safer and more comfortable
    • Improve the ability to function
    • Calm down and feel less anxious

    Environmental and Supportive Interventions

    This type of treatment can be done by doctors, nurses, or caretakers. It can help you readjust to your surroundings and reduce anxiety. Examples of this intervention include:
    • Placing a clock and calendar in your room.
    • Darkening the room at night and providing natural light during the daytime hours.
    • Maintaining a quiet, noise-free room.
    • Reminding you often of the day and time, where you are, and why you are there.
    • Placing familiar objects around you, such as family photographs or objects from home.


    A number of steps have been shown to help prevent delirium in hospitalized patients at risk for delirium. These steps include:
    • Using memory orientation aids
    • Listening to relaxation tapes
    • Doing light exercise—when possible and if advised by your doctor
    • Using vision and hearing aids when necessary
    • Drinking plenty of fluids to prevent dehydration
    Delirium is difficult to prevent because it has so many causes and it can come on suddenly.


    American Psychiatric Association http://www.psychiatry.org

    National Institute of Mental Health http://www.nimh.nih.gov


    Canadian Psychiatric Association http://www.cpa-apc.org

    Canadian Psychological Association http://www.cpa.ca


    Delirium in hospitalized patients. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated September 15, 2014. Accessed September 17, 2014.

    Gleason O. Delirium. Am Fam Physician. 2003;67(5):1027-1034.

    Revision Information

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