How to Let Go of Thoughts You Can't Stop Thinking About

Maybe it's something you said yesterday.

A conversation you keep replaying. A future situation you're worried about. Something you wish you could change, even though it's outside your control.

You tell yourself to stop thinking about it.

But a few minutes later, there it is again.

If you've experienced this, you're familiar with one of the frustrating features of the human mind: we can't always decide which thoughts appear.

What we may be able to change is how we respond when they do.

And decades of psychological research suggest that acceptance can sometimes be more useful than trying to force unwanted thoughts away.

Why is it so hard to stop thinking about something?

Trying to suppress a thought can sometimes make it more persistent.

In a famous 1987 experiment, psychologist Daniel Wegner and colleagues asked participants to avoid thinking about a white bear. [1]

The task sounds simple.

But avoiding a particular thought requires keeping track of whether you're thinking about it. That very process can make the unwanted thought more accessible.

Participants who initially tried to suppress thoughts of the white bear subsequently reported more thoughts about it when instructed to think freely, compared with participants who hadn't suppressed it first.

The researchers called attention to the paradoxical effects of thought suppression.

Read Wegner and colleagues' original experiment.

Is the rebound effect scientifically established?

The picture is more nuanced than one famous experiment.

In 2001, researchers conducted a meta-analysis of controlled studies examining whether deliberately suppressing thoughts produces paradoxical effects. [2]

They found evidence of thought-suppression effects, but results varied depending on how the experiments were conducted.

This means suppressing a thought doesn't inevitably make it stronger. Still, deliberately fighting thoughts isn't always an effective way to manage them.

Read the 2001 meta-analysis.

What does it actually mean to let go?

Letting go doesn't have to mean forgetting what happened, eliminating an emotion, or pretending that something doesn't matter.

In psychology, one relevant concept is acceptance.

Acceptance means recognizing an experience without automatically fighting it, avoiding it, or treating its presence as a problem that must immediately be solved.

For example:

Instead of:

"I shouldn't be worrying about this. I need to stop."

You might try:

"I'm noticing that I'm worried about this."

The worry hasn't necessarily gone anywhere.

But you've changed your response from struggling against the thought to acknowledging that it's present.

This difference is central to several psychological approaches, including Acceptance and Commitment Therapy, commonly called ACT. [5]

What does the research say about acceptance?

A 2012 meta-analysis examined 30 experimental studies comparing acceptance with other emotion-regulation strategies, including suppression, distraction, and cognitive reappraisal. [3]

Across the studies, acceptance often showed advantages for outcomes such as negative emotions, pain tolerance, and how believable unwanted thoughts felt.

However, the results weren't uniformly in favor of acceptance.

Different emotional situations may call for different approaches, and acceptance isn't necessarily the best strategy in every circumstance.

Read the 2012 meta-analysis.

Can acceptance help with intrusive thoughts?

In a controlled study published in Behaviour Research and Therapy, researchers compared acceptance-based strategies with thought suppression for managing personally relevant intrusive thoughts. [4]

Participants instructed to suppress their thoughts experienced increased distress after trying to do so.

Those instructed to use acceptance experienced reduced discomfort, even though the frequency of intrusive thoughts did not decrease.

That's an especially important finding.

A thought can remain present while becoming less distressing.

The goal doesn't always need to be eliminating a thought. Sometimes, a different response to it can help.

Read the study on intrusive thoughts.

The science of psychological flexibility

Another concept closely related to acceptance is psychological flexibility.

Psychological flexibility involves responding to difficult internal experiences while continuing to make choices that reflect what matters to you. [5]

Imagine you're nervous about applying for a job.

You might think:

"What if they reject me?"

Trying to eliminate that fear before applying could leave you waiting indefinitely.

A psychologically flexible response might look more like:

"I'm anxious about rejection, but applying still matters to me."

The anxiety doesn't have to disappear before you take action.

What do larger studies show?

A 2025 meta-analysis examined 13 randomized controlled trials involving 1,362 people with depression. [6]

Researchers found that Acceptance and Commitment Therapy improved depressive symptoms, anxiety, and psychological flexibility compared with control conditions.

The standardized effect on psychological flexibility was approximately 0.50, a moderate effect.

However, the researchers did not find a statistically significant improvement in automatic negative thoughts.

That's consistent with an important principle: psychological improvement doesn't always require unwanted thoughts to stop occurring.

The evidence also had limitations. Depending on the outcome, the researchers rated certainty from very low to moderate.

Read the 2025 meta-analysis.

What about acceptance exercises delivered through apps?

Research has also examined self-guided, online ACT interventions.

A 2023 meta-analysis included 53 randomized controlled trials involving 10,730 participants. [7]

Online ACT interventions generally produced better outcomes than waitlist controls for anxiety, depression, quality of life, and psychological flexibility.

However, these were structured interventions, often involving multiple components delivered over time.

Read the 2023 online ACT meta-analysis.

How to practice letting go of a difficult thought

You don't need to understand every theory of emotion regulation to try a small acceptance exercise.

Here's one simple approach.

The Allow & Release exercise

1. Notice what's weighing on you.

   It could be a worry about something that hasn't happened, frustration about something you can't control, or a feeling that keeps returning.

   You don't have to choose the biggest problem in your life.

   Start with something manageable.

2. Give the experience a name.

   You might say:

   "I'm noticing worry."

   "I'm feeling disappointed."

   "There's a thought about something I can't control."

   You can write it down if that feels helpful, but you don't have to.

3. Make room for the thought.

   Instead of immediately debating the thought or trying to eliminate it, acknowledge its presence.

   You might gently remind yourself:

   "I can let this thought be here without chasing it."

   Notice the difference between having a thought and needing to follow it.

4. Imagine loosening your grip.

   Picture the thought as something you can allow to drift farther away.

   A cloud moving across the sky. A leaf floating down a river. A little light slowly fading into the distance.

   This is a symbolic exercise, not a method for physically removing a thought from your mind.

   The point isn't to force the thought to disappear.

   It's to practice allowing the thought to exist without giving it all your attention.

5. Return to the present.

   Notice where you are.

   Feel your feet on the floor or take a comfortable breath.

   You can return to whatever you were doing, even if the thought hasn't completely gone away.

That's enough for now.

Does imagining a thought drifting away actually work?

Imagery and metaphor are sometimes used in acceptance-based psychological interventions to help people experience thoughts differently.

Another relevant concept is cognitive defusion: learning to experience thoughts as mental events rather than unquestionable facts or instructions.

But evidence for individual defusion techniques is mixed.

For example, a 2021 experimental study examining a word-repetition defusion exercise did not find the predicted improvements across its measured outcomes. [8]

The results illustrate why it's important to distinguish a theoretically plausible technique from one whose exact effects have been demonstrated.

Instead, it's best understood as a gentle visual metaphor that may help someone practice acknowledging a thought and shifting their attention.

Read the 2021 experimental study.

Does letting go mean giving up?

Absolutely not.

Acceptance and resignation are different.

Acceptance means acknowledging what's happening internally or externally.

Resignation means abandoning the possibility of responding or making changes.

You can accept feeling anxious about a difficult conversation and still decide to have it.

You can acknowledge sadness about a relationship and still establish healthier boundaries.

You can recognize uncertainty about your future and still work toward something meaningful.

Sometimes letting go means releasing an impossible demand, like needing complete certainty before making a decision.

It doesn't mean giving up on what matters to you.

When might acceptance not be enough?

Acceptance isn't a substitute for addressing real problems.

If you're experiencing an unsafe situation, the appropriate response may involve seeking support, establishing boundaries, or taking practical action.

And if distressing thoughts are persistent, severely disruptive, or connected to a mental health condition, a brief self-guided exercise may not provide enough support.

Professional psychological treatments can involve careful assessment, structured practice, and techniques selected for a person's circumstances.

You also don't need to force yourself to disclose or revisit painful experiences simply to complete a wellness exercise.

It's okay to stop, choose a lighter topic, or return when you feel ready.

You don't have to carry every thought

Your mind will keep producing thoughts.

Some will be helpful. Some will be uncomfortable. Some will return when you least expect them.

You don't have to turn every thought into a problem to solve.

You don't have to believe everything your mind tells you.

And you don't have to wait for perfect peace before continuing with your day.

Sometimes, you can simply notice what's there, give yourself a little room, and move forward.

That's the idea behind Allow & Release, Tappling's Let Go exercise.

With your little companion beside you, you can name something that's weighing on you, acknowledge how you feel, and watch a small glowing light gently drift away.

The experience doesn't promise to erase your thoughts or change circumstances outside your control.

It's simply an invitation to loosen your grip for a moment.

You can carry on, even when everything isn't resolved.