You refresh your phone waiting for a reply that doesn't come. You imagine ten versions of a medical result before you have it. You need to know now whether the plan will work out, whether that person is annoyed with you, whether everything will go the way you hope. That difficulty in living with 'I don't know yet' has a name: intolerance of uncertainty.
We all prefer to have things clear; the problem appears when we can't stand not knowing them at all. In this article I'll explain what intolerance of uncertainty is, why doubt is so hard for us, how it relates to anxiety and, above all, what you can do to manage it and get your calm back without needing to control everything.
What intolerance of uncertainty is
Intolerance of uncertainty is the difficulty in accepting and bearing that we don't know what will happen. The American Psychological Association defines it as the tendency to react negatively —emotionally, cognitively and behaviourally— to uncertain situations and events. It isn't about whether you like a surprise or not: it's that 'I don't know' creates a discomfort you need to get rid of somehow. That need for certainty, when it's very high, shapes how you decide, how you worry and how you live day to day.
Why we find it so hard not to know
The human brain is a prediction machine. Anticipating what's coming —where the danger is, what will happen next— has helped us survive for thousands of years. That's why, when a situation is uncertain, the brain tends to read it as a possible threat and sets off the alarm, even when objectively there's no danger. On top of that, we live in a culture that promises that with enough information and planning everything can be controlled. The combination is explosive: the more we expect to have everything under control, the worse we cope with the fact that life is, by nature, unpredictable.
Signs of high intolerance of uncertainty
It isn't always easy to recognise, because it disguises itself as responsibility or caution. Some common signs:
How to tell if your tolerance of uncertainty is low
- You need reassurance. You ask again and again 'are you sure it'll be fine?', looking for a guarantee that's never enough.
- You check too much. You reread messages, go over things you've already done, look up symptoms online non-stop.
- You over-plan. You want to foresee every possible scenario before you move, and still you don't feel at ease.
- You struggle to decide. You put off decisions waiting to be completely sure, which almost never happens.
- You avoid the new. You turn down plans or opportunities just because you don't know how they'll turn out.
- You imagine the worst. Faced with a doubt, the mind goes straight to the most catastrophic scenario.
The connection with anxiety
Intolerance of uncertainty is one of the underlying drivers of anxiety. The World Health Organization notes that anxiety disorders are the most common mental disorders, and uncertainty plays a central role in them: because we can't stand not knowing, we try to 'foresee everything' by worrying non-stop. It shows especially in generalised anxiety disorder and in anticipatory anxiety, where the suffering comes precisely from anticipating things that haven't happened yet. Knowing how to manage anxiety almost always runs through learning to tolerate doubt better.
How it's maintained: worry and safety behaviours
If intolerance of uncertainty simply made you suffer, it would be easier. The trouble is that it pushes us to do things that, without meaning to, keep it going. The main one is worry: turning a problem over and over trying to find a certainty that will settle us. But worrying doesn't resolve uncertainty, it only feeds it, and it often ends in rumination. To this we add safety behaviours —checking, seeking reassurance, over-preparing—: they relieve you for a moment, but they teach the brain that you can't cope without them. So each check makes your tolerance a little smaller.
The control trap
Behind all of this is a tempting promise: 'if I control everything, I won't suffer'. But absolute control doesn't exist; life has a part that simply doesn't depend on us. The more we try to remove all uncertainty, the more fragile we become in the face of any doubt, because we've never trained ourselves to live with it. The paradox is that calm doesn't come from having everything under control, but from discovering that you can be well even without knowing everything.
How to manage intolerance of uncertainty
The good news is that intolerance of uncertainty can be worked on, like any other mental habit. It isn't about becoming indifferent, but about learning to live with 'I don't know' without it running the show. These steps help:
- Spot the safety behaviours. Identify what you do to get rid of the doubt (checking, asking, searching) and start cutting it down gradually.
- Expose yourself to uncertainty on purpose. Leave a message without rereading it, make a small decision without researching everything: it's 'gym' for your tolerance.
- Question the 'I need to be sure'. Wanting to be sure is one thing and needing to be is another; most decisions are made well with reasonable doubt.
- Put a limit on worry. Set aside a specific slot and, outside that slot, park it; you don't have to solve everything now.
- Act without having it all clear. Action breaks the loop: doing it and seeing that you survive teaches the brain that doubt isn't an emergency.
Techniques for everyday life
In the middle of the unease, it helps to have concrete tools. Focus on what does depend on you and let go of the rest; the American Psychological Association recommends precisely focusing on what you can control and taking one day at a time. A useful question when facing a doubt is 'and if I don't know, what can I do now?', which pulls you out of the imagined future and back to the present. And when the mind races, coming back to the body —noticing your breath, your feet on the floor— helps bring the alarm down.
Accepting what doesn't depend on you
A big part of managing uncertainty is learning to tell apart what you can change from what you can't, and letting go of the second. It doesn't mean resigning yourself or not caring; it means putting your energy where it counts and sparing yourself the wear of fighting what you don't control. That capacity to adapt to what comes, even when it isn't what you expected, is the heart of resilience, and it can be trained.
Mindfulness: coming back to the present
Much of the suffering over uncertainty lives in the future: in what 'might' happen. Mindfulness is, at heart, the training of being here and now instead of getting lost in imagined scenarios. It doesn't make doubts disappear, but it pulls you out of the 'what if...' loop and back to the present moment, which is the only place where you can actually do something. Practising mindfulness, even a few minutes a day, makes uncertainty more bearable.
Common mistakes
Meaning to calm yourself, you sometimes do exactly what keeps it going. Searching for more and more information is the most typical: it looks like it prepares you, but it only delays the moment of tolerating the doubt. Avoiding decisions 'until you're sure' drags them out forever and grows the distress. Demanding total certainty before acting leaves you paralysed. And endlessly asking for reassurance moves your calm outside you, when what you need is to learn to hold yourself steady.
When to seek professional help
If the need to have everything under control keeps you awake, takes up much of your day, stops you deciding or enjoying things, or if the checking and reassurance-seeking have eaten into your time and your relationships, it's worth asking for help. Intolerance of uncertainty usually goes hand in hand with anxiety, and looking at it with someone lets you understand it and train new responses.
How therapy helps
In therapy we work on intolerance of uncertainty at the root: understanding why doubt feels so threatening to you and training, step by step, your capacity to live with it. With cognitive behavioural approaches we reduce safety behaviours, question the need for certainty and help you worry less. I do this through anxiety therapy and, if it suits you better, through online therapy, in English, Spanish or Catalan.
If you notice that the need to control everything is taking away your calm, get in touch for a first, no-obligation assessment. And hold on to one idea: you don't need to know everything to be well; you can learn to live with doubt and even to feel calm with it.