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  1. Content medically reviewed by
    Dr. Abhimanyu Chandakverified specialist
    MD, Psychiatry
    View full profile onLinkedIn logoLinkedIn

    Fixed, false conviction in something that is not real or shared by other people.

    Common Causes

    Delusion is not always related to an underlying condition. It may be caused by:

    • Stress
    • Alcohol and drug abuse
    • Certain medications
    Related Conditions
    Sometimes delusion may signify an underlying health condition. These conditions include:

    For informational purposes only. Consult a medical professional for advice.

    Reviewed by a panel of doctors. Source: Focus Medica. Learn more

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  2. Dictionary

    de·lu·sion
    [dɪˈluːʒ(ə)n]
    noun
    delusion (noun) · delusions (plural noun)
    1. a false belief or judgment about external reality, held despite incontrovertible evidence to the contrary, occurring especially in mental conditions:
      "he began to experience hallucinations, delusions, anxiety, and agitation along with dizziness and nausea" · "the delusion of being watched"
    Origin
    late Middle English (in the sense ‘act of deluding or of being deluded’): from late Latin delusio(n-), from the verb deludere (see delude).
    Translate delusion to
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  7. Delusion, in psychology, a rigid system of beliefs with which a person is preoccupied and to which the person firmly holds, despite the logical absurdity of the beliefs and a lack of supporting evidence. Delusions are symptomatic...see more

    Insight :Delusions are beliefs that persist despite clear evidence to the contrary

    Insight :Delusional disorder is a condition with persistent non-bizarre delusions lasting at least one month

    Insight :The prevalence of delusional disorder is about 0.02% across the population

    Insight :Delusions can be categorized as bizarre or non-bizarre

    Quiz :What is a delusion in psychology?

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  8. DELUSION | definition in the Cambridge English Dictionary

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  14. Delusion (Stanford Encyclopedia of Philosophy)