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State of the Science: Intolerance of Uncertainty
Michel J Dugas1, Naomi Koerner2, Mark H Freeston3
1Université du Québec en Outaouais.
Behavior Therapy
|January 31, 2026
Summary
Intolerance of uncertainty (IU) is a key factor in mental health, impacting worry and generalized anxiety disorder (GAD). Research shows IU is a transdiagnostic construct, relevant across various conditions and situations.
Area of Science:
- Psychology
- Psychiatry
- Mental Health Research
Background:
- Intolerance of uncertainty (IU) was conceptualized over 30 years ago as a potential cognitive vulnerability for worry and generalized anxiety disorder (GAD).
- Initial research using the Intolerance of Uncertainty Scale (IUS) suggested IU was a specific marker for worry and GAD.
- Subsequent research has established IU as a transdiagnostic and trans-situational construct, extending beyond its initial conceptualization.
Purpose of the Study:
- To review the extensive body of research on intolerance of uncertainty (IU).
- To examine the specificity, construct, measurement, and transdiagnostic nature of IU.
- To explore cultural considerations, cognitive processing, neural correlates, treatment implications, and future research directions for IU.
Main Methods:
- Comprehensive literature review of studies on intolerance of uncertainty (IU).
- Analysis of research focusing on the specificity, measurement, and broader applicability of IU.
- Synthesis of findings related to cognitive, neural, and treatment aspects of IU.
Main Results:
- While IU shows some specificity to worry and GAD, it is broadly applicable across diverse psychological conditions and situations.
- Research has advanced the understanding of IU's role in cognitive processing, neural correlates, and psychophysiology.
- Significant progress has been made in both the theoretical understanding and clinical application of IU.
Conclusions:
- Intolerance of uncertainty (IU) is a central and well-established construct in mental health and psychopathology.
- Despite ongoing debates regarding its definition and measurement, IU research has significantly improved theory and clinical practice.
- Understanding IU provides crucial insights into how individuals experience, think, feel, and behave when facing uncertainty.
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