Intolerance of uncertainty is one of the core drivers of anxiety. It is the tendency to experience uncertainty as uncomfortable, threatening, or unacceptable. Research by Dugas, Barlow, and Carleton shows that people with high intolerance of uncertainty overestimate threat, worry more, and rely heavily on avoidance and safety behaviours.
This process interacts closely with worry loops, cognitive distortions, and the anxiety cycle.
Intolerance of uncertainty is not simply disliking the unknown — it is reacting to uncertainty as if it were dangerous. The mind tries to eliminate ambiguity by predicting, controlling, or preparing for every possible outcome.
Signs include:
The threat system prefers predictability. When outcomes are unclear, the brain fills the gap with imagined danger. Research by Carleton suggests that “the unknown” is one of the most powerful triggers for anxiety because the mind cannot prepare for it.
This leads to:
These processes are also described in hypervigilance and anxiety sensitivity.
When uncertainty feels dangerous, the mind tries to eliminate it through worry, checking, reassurance seeking, or avoidance. These behaviours reduce anxiety temporarily but reinforce the belief that uncertainty is unsafe.
This creates a self-reinforcing loop:
This loop is similar to the patterns described in avoidance loops.
“If I prepare enough, nothing bad will happen.” Preparation reduces uncertainty, not danger.
“Uncertainty means something is wrong.” Uncertainty is a normal part of life, not a warning signal.
“I can’t cope unless I know what will happen.” This belief is learned — not a fact.
CBH helps build tolerance for uncertainty through methods supported by research from Dugas, Barlow, and Alladin.
This approach is especially effective when combined with worry retraining and attention training.