What Intolerance of Uncertainty Really Means
The concept of Intolerance of Uncertainty (IU) helps explain why many people struggle with ambiguity today. IU, defined as a dispositional trait, includes negative beliefs about uncertainty and leads to unpleasant emotional, cognitive, and behavioral responses when situations are unclear. Michel Dugas and Kristin Buhr, researchers in the field, identified IU as a core driver of chronic worry and first linked it to generalized anxiety disorder.
IU is transdiagnostic, meaning it underlies a range of mental health problems, including anxiety, depression, obsessive-compulsive disorder, and eating disorders. Over the last twenty years, studies (including work by R. Nicholas Carleton) have argued that fear of the unknown may be a fundamental fear across these disorders. Carleton’s work in journals such as the Expert Review of Neurotherapeutics and the Journal of Anxiety Disorders describes IU as a broad, dispositional risk factor for significant anxiety.
Why Negative Capability Matters
The idea of negative capability, first coined by poet John Keats in December 1817, also appears in psychological discussions. Keats defined it as the ability to remain “in uncertainties, mysteries, doubts, without any irritable reaching after fact and reason.” In his phrasing, it is the practice of embracing the unknown.
Psychoanalyst Wilfred Bion applied Keats’s idea in clinical practice, arguing that tolerating the discomfort of not knowing is preferable to forcing premature answers. Keats cited himself and Shakespeare as examples and contrasted them with Coleridge, whom he thought sacrificed depth for philosophical certainty. Keats identified this mental quality long before psychologists began measuring intolerance of uncertainty.
How Modern Life Makes It Harder
Contemporary technology makes it easy to avoid the discomfort of uncertainty: phones, social media, and on-demand services provide rapid answers or distractions. In 1995, people had fewer immediate options; today many reach for devices first, which can weaken their ability to sit with not knowing. Constant notifications, social feeds, and digital escape routes combine with economic instability, political volatility, information overload, and shifting social norms, increasing the demand for mental steadiness.
Research published in Addictive Behaviors and Computers in Human Behavior has found that higher IU is linked to problematic smartphone use. People higher in IU tend to treat phones as ready-made coping tools, reinforcing avoidance and reducing their tolerance for uncertainty.
How Treatment Works and What’s Next
Because IU can be targeted, psychologists have developed behavioral experiments and treatment studies to reduce IU, chronic worry, anxiety, and depression. These approaches expose people to uncertain situations without allowing avoidance, and results show meaningful improvement. The Intolerance of Uncertainty Model and the Intolerance of Uncertainty Scale, developed by Dugas, Freeston, and colleagues, are central tools in these interventions.
Learning negative capability and increasing tolerance for uncertainty does not mean the feeling becomes enjoyable. The objective is to stick with the discomfort and gradually reduce fear. That shift encourages reconsideration of how people respond to uncertainty, viewing ambiguity as a space where some forms of learning and adjustment can occur rather than as a problem that must be fixed.
As society continues to change and present new unknowns, the ability to sit with the unknown is increasingly relevant to mental well-being. The skill itself, and the work to build it, have clear implications for mental health in a shifting environment.
