There is a particular kind of exhaustion that comes from feeling like life keeps getting it wrong.
Things don’t go the way they should.
People don’t behave how they ought to.
You don’t perform as well as you must.
And somehow, every one of these feels not just disappointing — but absolutely unacceptable.
If this sounds familiar you may simply be operating under a very human mental rule that psychology has studied closely: demandingness.
Let’s explore what demandingness actually is, why it creates so much emotional strain, how it quietly shapes anxiety, anger, and burnout, and why letting go of rigid “musts” and demands is not about lowering your standards — but about suffering less whilst living fully.
What Is Demandingness, Really?
Demandingness refers to a rigid belief that reality must be a certain way.
Not “I would like this.”
Not “This matters to me.”
But “This has to happen — and if it doesn’t, something is terribly wrong.”
In Rational Emotive Behaviour Therapy (REBT), demandingness is described as an absolutistic belief, usually expressed through words like must, should, or have to. These beliefs turn preferences into non-negotiable rules imposed on oneself, other people, or life itself (Ellis, 1957, as cited in O’Kelly et al., 1998).
For example:
- “I want to succeed” becomes “I must succeed.”
- “I’d like approval” becomes “People must approve of me.”
- “I prefer comfort” becomes “Life should not be this hard.”
The difference may sound subtle, but emotionally, it is enormous.
Preferences allow space for disappointment.
Demands invite guaranteed distress.
Importantly, demandingness is not the same as ambition, values, or having high standards. You can care deeply about outcomes without mentally insisting that reality completely obey your wishes. REBT makes this distinction very clearly: it is not desire that causes emotional suffering, but the rigid insistence that desire must be fulfilled (DiGiuseppe, 1996, as cited in Michel-Kröhler & Turner, 2022).
Why Rigid Demands Hurt So Much
At its core, demandingness creates distress because it puts us in a constant argument with reality.
Reality, unfortunately, is not known for playing fair.
When you believe something must happen, any deviation is experienced not just as unpleasant, but as intolerable. This creates what researchers describe as cognitive rigidity — an inflexible way of interpreting events that leaves little room for acceptance, adjustment, or emotional regulation (Michel-Kröhler & Turner, 2022).
Think of it like driving with an internal rulebook that says:
“The road must be smooth. Traffic must cooperate. Detours must not exist.”
Every bump then can feel like a personal insult.
Research consistently shows that irrational beliefs characterised by rigidity and extremity are associated with unhealthy emotional responses, because they block acceptance of non-preferred outcomes (Chadha et al., 2019). When a rigid demand is violated, the emotional system reacts as though something catastrophic has occurred — even when the event itself is manageable.
This is why demandingness often amplifies emotions:
- Disappointment escalates into anxiety
- Frustration hardens into anger
- Setbacks collapse into shame (or other unhelpful negative emotions)
A large meta-analysis found that irrational beliefs (including demandingness) show a moderate positive association with psychological distress, across anxiety, depression, anger, and guilt (Vîslă et al., 2016). In other words, the more rigid the belief, the louder the emotional fallout.
The Domino Effect: One “Must”, Many Problems
REBT describes demandingness as a primary irrational belief — the first domino to fall.
Once a rigid demand is in place, other unhelpful beliefs tend to follow.
If “I must succeed” is violated, the mind may respond with:
- “This is awful” (catastrophising)
- “I can’t stand this” (low frustration tolerance)
- “This proves I’m a failure” (self-downing)
Research supports this hierarchical structure. Studies using factor analysis and structural modelling have found that demandingness often predicts these secondary beliefs, which then intensify emotional distress (Duru & Balkis, 2019; Santarpia et al., 2023).
What’s important here is not memorising the terminology, but recognising the pattern:
the “must” sets the stage, and the emotional drama follows.
How Demandingness Shows Up in Mental Health
Demandingness does not usually appear as a single, neat problem. Instead, it invisibly increases vulnerability across different forms of emotional distress. Research suggests that rigid “must” beliefs tend to intensify emotional reactions rather than help people cope with life’s difficulties.
In particular, demandingness has been associated with:
- Anxiety, especially in situations involving performance, approval, or uncertainty. Individuals who hold rigid demands such as “I must not fail” or “Others must approve of me” are more likely to appraise stressful situations as threatening, which in turn heightens anxiety responses (Chadha et al., 2019; David et al., 2002, as cited in Chadha et al., 2019).
- Depressive distress, particularly when unmet self-directed demands escalate into global self-criticism. When rigid expectations about success, competence, or worth are violated, demandingness often fuels self-downing beliefs (e.g., “This proves I’m worthless”), which are closely associated with depressive symptoms (Vîslă et al., 2016; Duru & Balkis, 2019).
- Anger-related distress, most commonly when rigid expectations are directed at others or at how life “should” be. Demands around fairness, respect, or correct behaviour (“People must treat me fairly”) are frequently linked to heightened frustration and anger when those expectations are violated. While not always measured in isolation, irrational beliefs as a group — including demandingness — have been consistently associated with anger and hostile emotional reactions (Vîslă et al., 2016; Martin & Dahlen, 2007).
Taken together, these findings support the view that demandingness operates as a transdiagnostic cognitive risk factor. Rather than producing one specific disorder, rigid demands increase the intensity, persistence, and emotional cost of distress across anxiety, depression, anger, and general psychological strain (Vîslă et al., 2016).
The Invisible Cost in Everyday Life
Beyond symptoms and scales, demandingness has very real everyday consequences.
In relationships, rigid expectations often breed chronic disappointment. When someone believes their partner must always understand them or never make mistakes, resentment quietly accumulates. REBT literature has long noted that such absolutistic expectations are a reliable recipe for relational conflict (Ellis, 1973).
At work, self-directed demands frequently masquerade as motivation. In reality, they often fuel perfectionism, burnout, and paralysis. Studies show that individuals with strong irrational demands invest excessive effort under stress — yet experience lower well-being and even reduced performance over time (Santarpia et al., 2023).
And in daily life, demandingness shrinks tolerance for inconvenience. Traffic jams feel unbearable. Delays feel unjust. Minor frustrations provoke disproportionate reactions. Life becomes something to endure rather than explore and discover.
What Therapy Does Differently
Therapeutic work with demandingness does not involve persuading people to “care less.”
It involves helping them care without suffering.
In REBT-informed therapy, rigid demands are gently identified, questioned, and transformed into flexible preferences. The shift might sound like this:
- From: “I must do well or I’m worthless.”
- To: “I strongly want to do well — and I accept myself even if I don’t.”
Research indicates that reductions in demandingness are associated with subsequent decreases in emotional distress (Vîslă et al., 2016). Importantly, this shift preserves motivation while removing the emotional punishment attached to imperfection. A world full of carrots, without a cruel stick to be seen.
Therapy does not argue that setbacks are pleasant. It simply removes the idea that they are unbearable, catastrophic, or definitive.
Letting Go of “Musts” Is Not Giving Up
This is often where people hesitate.
If I stop demanding, won’t I lose my edge?
Won’t I become complacent, passive, or unmotivated?
Research suggests the opposite.
Letting go of rigid “musts” does not mean abandoning goals or lowering standards. Instead, therapy focuses on transforming absolutistic demands into strong but flexible preferences — allowing people to continue striving for what matters without tying their self-worth or emotional stability to perfect outcomes (Ellis, 1973; Turner & Barker, 2013).
Research consistently shows that rational beliefs — characterised by flexibility, non-extremity, and acceptance — are associated with healthier emotional responses than rigid, demanding beliefs. When individuals replace demands with preferences, they are better able to tolerate setbacks without escalating into anxiety, shame, or anger (Chadha et al., 2019; Vîslă et al., 2016).
Importantly, this shift is not associated with disengagement. On the contrary, outcome and process studies indicate that reductions in demandingness are linked to improved coping and problem-solving, precisely because failures and obstacles are no longer experienced as catastrophic or identity-threatening (Turner & Barker, 2013; Vîslă et al., 2016).
Without the internal ultimatum — this must not happen — disappointment becomes manageable, effort becomes sustainable, and challenges can be met with persistence rather than panic. In this sense, letting go of “musts” is not about caring less, but about suffering less while continuing to care deeply.
Demandingness is not a flaw. It is an understandable attempt to control pain by insisting on certainty, fairness, or success. Flexibility often feels harder at first — which is why rigid rules can seem so tempting, even when they hurt us.
But when preferences harden into rules, life begins to feel hostile — and we pay the emotional price.
Learning to replace rigid “musts” with flexible preferences is not about settling for less. It is about freeing yourself from unnecessary suffering, and meeting life as it actually is — complex, imperfect, and still profoundly worth it.
And if you need help on this journey we’re always just a call away!
References
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- Chadha, N. J., Turner, M. J., & Slater, M. J. (2019). Investigating irrational beliefs, cognitive appraisals, challenge and threat, and affective states in golfers approaching competitive situations. Frontiers in Psychology, 10, 2295. https://doi.org/10.3389/fpsyg.2019.02295
- DiGiuseppe, R. (1996). The nature of irrational and rational beliefs: Progress in rational emotive behavior theory. Journal of Rational-Emotive & Cognitive-Behavior Therapy, 14(1), 5–28. https://doi.org/10.1007/BF02238091
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