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Intrusive Thoughts: When Unwanted Thoughts Become a Problem

Written and clinically reviewed by Felix Murad, M.Ed., LPC-S (TX), LMHC (WA), CMHC (NH), NCC · Last updated September 2026 · Editorial standards

A plain-language guide to unwanted, intrusive thoughts: why almost everyone experiences them, what turns them into a problem, how OCD, trauma, worry, and low mood produce different types of intrusions, and what treatments can help.

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You didn’t pick the thought, and now you’re left with the question it left behind. It’s okay; just take your time to explore it.

It could be an image of a car drifting over the center line, a sudden impulse to push someone on the platform, a sexual thought about someone you would never want to think of that way, a flash of your child being harmed, a blasphemous phrase during prayer, or a sudden doubt about whether you truly love your partner that refuses to go away.

Most people have thoughts like these. Most people also shrug them off within seconds. If you are reading this page, you probably did not shrug it off. You looked at the thought, asked what it said about you, and the asking has not stopped.

This guide is for you. It explains what intrusive thoughts are, why they are so common, what distinguishes an ordinary intrusion from one that has become a clinical problem, and what evidence-based treatment looks like. It is written by a licensed counselor who treats intrusive thoughts every week. It is not a substitute for an assessment, and nothing here can diagnose you. It can, however, give you accurate language for what you are experiencing, which is often the first step that helps.

What intrusive thoughts are

An intrusive thought is a thought, image, or urge that enters your mind uninvited, does not fit your values or intentions, and tends to come back. Clinicians call this quality ego-dystonic: the thought feels foreign to who you are. That foreignness is a defining feature, and it matters later because it separates an intrusion from a wish.

Intrusions tend to cluster around a relatively small set of themes, many of which appear across cultures. Researchers who surveyed adults in 13 countries across six continents found that unwanted intrusive thoughts were remarkably common, including doubts, contamination, harm, unwanted sexual content, and religious or moral themes (Radomsky et al., 2014). The specific content may vary across people and cultures, but unwanted intrusive thoughts are far from unusual.

One point deserves to be stated early and plainly. The content of an intrusive thought is not evidence of your character, desires, or future behavior. A thought about harming someone is not a plan. A sexual intrusion is not an attraction. A doubt is not a decision. What distinguishes people who develop a lasting problem from those who do not is not the content of their thoughts. It is what they conclude about the thought and what they do next.

Are intrusive thoughts normal?

Yes. This is one of the most replicated findings in the study of obsessive-compulsive problems, and it surprises almost everyone who hears it for the first time.

In 1978, Rachman and de Silva asked a group of adults with no psychiatric history whether they had ever experienced unwanted, intrusive thoughts. About 80 percent said yes. When the researchers compared those thoughts with the obsessions of people diagnosed with OCD, the two lists were difficult to distinguish by content alone. Both groups reported thoughts of harming others, unwanted sexual content, and images of accidents. What differed was frequency, how long each thought lasted, how intense it was, and what followed (Rachman & de Silva, 1978).

Later studies found the same pattern with larger, more diverse samples. In the international study mentioned above, nearly all of the adults surveyed, about 94 percent, reported at least one unwanted intrusive thought in the previous three months (Radomsky et al., 2014). Purdon and Clark (1993) documented aggressive, sexual, and disease-related intrusions in a large sample of university students who had no diagnosis at all.

In other words, a mind that produces disturbing, unwanted thoughts is doing what minds do. The relevant question is never why I had that thought. It is why that thought stuck.

When intrusive thoughts become a problem

No bright line exists, but clinicians look for a consistent set of markers. Intrusive thoughts have usually crossed from ordinary to clinically significant when several of the following are true simultaneously.

  • They recur and take up time. The thought returns many times a day, or a single episode can last an hour or more.
  • They carry a verdict. The thought no longer feels like noise. It feels like information about who you are, what you might do, or what could happen.
  • You respond to them. You check, review, seek reassurance, confess, avoid, pray, count, or mentally argue with the thought to neutralize it or regain certainty.
  • Life is narrowing. You avoid people, places, objects, or activities because of the thought, or because you are exhausted from managing it.
  • It has lasted. The pattern has been present for weeks or months, not an afternoon.

Why appraisal matters more than content

Two lines of research from the 1980s and 1990s changed how clinicians understand this. Paul Salkovskis (1985) proposed that intrusive thoughts themselves are ordinary, and that obsessional problems develop when a person appraises an intrusion as a sign that they are responsible for preventing harm. Stanley Rachman (1997) extended the model: obsessions persist as long as a person catastrophically misinterprets what the thought means about them, and they fade when that interpretation weakens.

An international working group later identified six kinds of beliefs that make an intrusion more likely to stick (Obsessive-Compulsive Cognitions Working Group, 1997). In everyday language:

  • Inflated responsibility. If I think it and something happens, it is on me.
  • Overimportance of thoughts. Having this thought means something significant. Shafran, Thordarson, and Rachman (1996) called one version of this thought-action fusion the sense that thinking about an act is morally equivalent to doing it, or makes it more likely to happen.
  • Need to control thoughts. A healthy person can stop this.
  • Overestimation of threat. Bad outcomes are more likely and more severe than they really are.
  • Intolerance of uncertainty. I have to know for sure before I can let this go.
  • Perfectionism. Any doubt, any error, any impure thought is unacceptable.

If you recognize yourself on that list, notice what it implies. Recovery work isn’t about having fewer thoughts. It is about changing your appraisal and response, and people can learn to do that.

Why trying to stop them makes them louder

The most natural response to a disturbing thought is to push it away. In a series of 1980s experiments, Daniel Wegner and colleagues asked participants not to think about a white bear. They could not do it, and when they were later allowed to think freely, the bear came back more often than it did for people who had never been told to suppress it (Wegner et al., 1987). A later meta-analysis of controlled studies found a small-to-moderate rebound effect: on average, suppression makes a target thought more frequent afterward, not less (Abramowitz et al., 2001).

For someone with intrusive thoughts, this creates a trap. The thought is upsetting, so you try to suppress it. Suppression brings it back. Its return feels like proof that it is important, which makes you try harder. The effort itself becomes the disorder. If this loop is familiar, my guide to thought suppression and why it backfires in OCD goes into the research and the alternatives in depth.

Intrusive thoughts and OCD

Obsessive-compulsive disorder is the condition most closely associated with intrusive thoughts, and for good reason. In OCD, the intrusion is called an obsession: a recurrent, unwanted thought, image, or urge that causes marked anxiety or distress. The person then performs a compulsion, a behavior or mental act meant to reduce the distress or prevent a feared outcome. Relief is brief; the obsession returns, and the cycle tightens (American Psychiatric Association, 2022).

Many people do not recognize their compulsions because they are invisible. Mentally reviewing an event to confirm nothing bad happened, silently repeating a phrase, replaying a conversation, arguing with the thought, scanning your body for a reaction, or asking a partner one more time whether everything is okay are all compulsions. The label Pure O, meaning obsessions without compulsions, is a misnomer for this reason: the compulsions are there, they are just covert. I cover this in detail in my guides to mental compulsions and the myths around Pure O.

OCD is organized around themes, and each theme has its own guide on this site. The short descriptions below are meant to help you find the right one.

Harm

Intrusive thoughts or images of hurting yourself or someone else, often someone you love, accompanied by fears of snapping or losing control. People with this theme are typically among the least likely to act on these thoughts and the most tormented by them. Start with the Harm OCD guide.

Sexual and taboo content

Unwanted sexual thoughts about children, family members, or violence, or intrusive doubts about your own sexual orientation. These are the intrusions people are least willing to say out loud and the ones non-specialist clinicians most often misread. See taboo intrusive thoughts, pedophilia-themed OCD (POCD), and sexual orientation OCD.

Death and losing someone

Intrusive images of a loved one dying, repeated checking on family members, or a preoccupation with your own mortality that has stopped feeling philosophical. The anticipatory grief and death OCD guide covers this pattern.

Relationships

Intrusive doubts about whether you love your partner, whether they are right for you, or whether you are attracted enough. See relationship OCD.

Religion, morality, and scrupulosity

Blasphemous intrusions, fear of having sinned, or relentless moral self-examination. See scrupulosity.

Contamination and health

Intrusive thoughts about germs, illness, or having harmed someone through carelessness, often paired with washing, checking, or reassurance-seeking. See contamination OCD and health anxiety OCD.

Existential questions

Looping thoughts about the nature of reality, consciousness, or meaning that feel urgent and unresolvable. See existential OCD.

Suicidal intrusions

Unwanted thoughts or images of ending your own life in a person who does not want to die and is frightened by the thought. This is distinct from suicidal ideation and needs careful assessment. See suicidal OCD. If you are in crisis right now, you can call or text 988 (the Suicide and Crisis Lifeline) for support, or go to your nearest emergency department.

Intrusive thoughts that are not OCD

Not every intrusive thought is an obsession, and a page about intrusive thoughts that focused only on OCD would be misleading. Several other conditions produce intrusions, and they tend to differ in texture rather than in topic. The descriptions below are meant to help you describe your experience to a clinician, not to sort yourself into a category.

Trauma-related intrusions

After a traumatic event, intrusions often take the form of memories: sensory fragments, images, or bodily sensations that feel like re-experiencing rather than imagining. They are tied to something that happened, often triggered by reminders, and can come with avoidance, hypervigilance, and mood changes. If this sounds closer to your experience, my guides to trauma-informed therapy and telling a trauma response from anxiety are a better starting point.

Depressive rumination

Rumination is repetitive, past-focused, evaluative thinking: replaying failures, asking why you are the way you are, reviewing what you should have done. It usually feels sad or heavy rather than alarming, and it tends to feel like your own thinking rather than an intruder. Rumination and OCD can coexist, and I have written about the overlap between rumination and OCD.

Worry in generalized anxiety

Worry is future-focused, verbal, and often feels productive, as if you are planning or preparing. It roams across topics (money, health, work, family) instead of fixing on one. Worry can be exhausting, but it usually does not carry the shame or sense of moral threat that marks an obsession. See the guide to generalized anxiety disorder.

Intrusive thoughts after having a baby

Unwanted thoughts of harm coming to a new baby are close to universal. In one study that followed new mothers, every participant reported intrusive thoughts of accidental harm in the first weeks, and about half reported unwanted thoughts of deliberately harming their infant (Fairbrother & Woody, 2008). These thoughts are typically ego-dystonic, horrifying to the parent, and part of the OCD spectrum rather than a sign of danger. They are different from postpartum psychosis, which involves a break from reality and requires urgent medical care. If you are a new parent with these thoughts, please read the postpartum OCD guide and talk to a clinician who knows the difference.

When the picture is less clear

Sometimes, what someone calls intrusive thoughts may be part of a different process, including conditions that influence how they perceive reality. Clinicians don’t base the distinction solely on thought content or individual features. Instead, they consider the entire presentation: how the experience is described, whether the person recognizes the thought as their own and untrue, their conviction in the thought, other symptoms involved, the context in which it started, and how it evolves. This requires a comprehensive clinical assessment rather than a simple checklist on a website. If you’re uncertain about what you’re experiencing, that doubt alone warrants professional evaluation.

What actually helps

Treatment varies depending on what triggers the intrusions, so starting with an assessment is essential. When it comes to intrusive thoughts that match the earlier-mentioned obsessional pattern, there’s a strong and clear evidence base supporting the approach.

Exposure and response prevention

Exposure and response prevention, or ERP, is a form of cognitive behavioral therapy that involves deliberately approaching the thoughts and situations that trigger intrusions while refraining from the compulsions that usually follow. The American Psychiatric Association’s practice guideline for OCD recommends CBT and serotonin reuptake inhibitors as first-line treatments, and specifies that CBT relying primarily on ERP has the best evidentiary support (American Psychiatric Association, 2007). ERP is not about proving the thought false. It is about learning, through experience, that you can have the thought, feel the anxiety, and not do anything about it, and that the anxiety and the urgency change when you stop feeding them. I describe how I structure this work in the ERP therapy guide.

Changing your relationship to the thought

Acceptance and commitment therapy, or ACT, approaches intrusions from a different angle: instead of trying to reduce the thought, you practice noticing it as a mental event, letting it be present, and moving toward what matters to you anyway. In a randomized trial of 79 adults with OCD, eight sessions of ACT without in-session exposure outperformed progressive relaxation training on OCD severity at the end of treatment and at follow-up (Twohig et al., 2010). ACT and ERP are often combined in practice. See the guides to ACT and to cognitive defusion for the specific skills involved.

Medication

Serotonin reuptake inhibitors are an evidence-based option for OCD, either alone or in combination with therapy (American Psychiatric Association, 2007). I am a counselor, not a prescriber, so medication decisions are made by a physician or psychiatric nurse practitioner. I regularly coordinate with prescribers when a client chooses to combine approaches.

What tends to make things worse

Asking for reassurance, searching online for certainty, confessing thoughts to unburden yourself, and avoiding triggers all reduce anxiety for a moment and strengthen the cycle over time. These are compulsions even when they feel like coping. My guides to reassurance seeking, compulsive googling, and compulsive confessing explain why and what to do instead.

Individual results vary. Treatment works best when the plan matches the underlying mechanism, which is why I don’t start ERP with anyone until I understand their intrusions and what keeps them going.

How I work with intrusive thoughts

I’m Felix Murad, a Licensed Professional Counselor and Supervisor based in Texas. I offer telehealth sessions to adults with intrusive thoughts and OCD across Texas, Washington, New Hampshire, and Florida. I intentionally run a small, personalized practice so I can truly get to know each individual I work with.

A first course of work usually looks like this. We start with an assessment of the intrusions, how you respond to them, and what else is going on, including screening for trauma, mood, and other anxiety problems. When OCD is suspected, the assessment includes a structured review of obsessions and compulsions using the Yale-Brown Obsessive Compulsive Scale. The treatment plan depends on getting the mechanism right. From there, we build a shared formulation: what the intrusion is, what you conclude about it, and how you respond. Then we plan the work itself, which for most people means ERP informed by inhibitory learning principles, often combined with ACT skills, and always at a pace we agree on. We track progress with the same measures used at the start so we can both see what is changing.

If you would like to know whether this is a fit, a consultation is the right first step. You can find fees and insurance information on the pricing page. If you are looking for a clinician outside my licensed states, my guide to finding a therapist for intrusive thoughts explains what to ask.

Frequently asked questions

The duration of the pattern can vary depending on how severe it is, how long you’ve been experiencing it, and how much practice you do between sessions. Structured ERP is intentionally designed to be limited in time, usually lasting from a few weeks to a couple of months, not years. Many people see positive changes before finishing the entire course. However, some might need a bit more time, especially if trauma or depression are involved. I prefer to give you an honest and personalized estimate after I’ve had a chance to assess your situation, rather than making guarantees beforehand.

No. Intrusive thoughts are unwanted and out of keeping with your values; they are the opposite of what you want. The distress you feel about the thought shows how much you don’t want it. In clinical practice, the people most troubled by harm or sexual intrusions are the people least likely to act on them, and the disorder feeds on that very fear.

Violent intrusions are among the most common intrusive thoughts reported by people with no history of violence. What clinicians assess is not whether you have the thought but how you relate to it: whether it horrifies you, whether you avoid situations because of it, and whether you are trying to neutralize it. That pattern points toward an anxiety or obsessional problem, not toward risk. If you are ever unsure about your safety or someone else’s, please seek an evaluation rather than trying to settle the question alone.

Your threat system responds to them as if they were real. When a thought triggers anxiety, the body reacts with the same physiology it would use for an actual danger, and that bodily reaction is then taken as evidence that the thought matters. Anxiety is not information about truth. It is information about how your nervous system appraised the thought.

Ordinary intrusions come and go all the time, and no one does anything about them. When intrusions become a problem, they tend to persist as long as the appraisal and compulsive responses do, because those maintain the cycle. Some people improve with good information and self-directed change. Many find that structured treatment gets them there faster and more reliably. Individual results vary.

Worry is usually future-focused, verbal, and feels like problem-solving, and it moves between topics. An obsessional intrusion is more likely to arrive as an image or urge, feel morally or personally threatening, fixate on one theme, and feel foreign to you. Both can be treated, but the approaches differ, which is one reason assessment comes first.

It can be. Compulsions can be entirely mental: reviewing, checking your feelings, silently reassuring yourself, praying, or arguing with the thought. People who describe themselves as having Pure O nearly always have compulsions once they know what to look for. The absence of visible rituals does not rule out OCD.

Yes, and a clinician who specializes in intrusive thoughts will not be shocked by it. Content matters less than you fear and more than you might expect: it does not change what the thought says about you, but it does shape how exposures are designed. If a therapist responds to taboo content with alarm rather than understanding, that tells you something useful about their experience with this problem.

If the thought has stuck, the next step is a conversation, not more research.

I provide a short consultation to discuss your experiences and assess if collaborating is beneficial. There’s no obligation, and you don’t need to have your thoughts fully figured out before contacting me. Trust me, I do not want to work with you if we are genuinely not the right fit!

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Felix Murad, M.Ed., LPC-S (TX), LMHC (WA), CMHC (NH), NCC · Licensed by the Texas Behavioral Health Executive Council · Telehealth for adults in Texas, Washington, New Hampshire, and Florida

References

  • Abramowitz, J. S., Tolin, D. F., & Street, G. P. (2001). Paradoxical effects of thought suppression: A meta-analysis of controlled studies. Clinical Psychology Review, 21(5), 683-703. https://doi.org/10.1016/S0272-7358(00)00057-X
  • American Psychiatric Association. (2007). Practice guideline for the treatment of patients with obsessive-compulsive disorder. American Journal of Psychiatry, 164(7, Suppl.), 5-53.
  • American Psychiatric Association. (2022). Diagnostic and statistical manual of mental disorders (5th ed., text rev.). https://doi.org/10.1176/appi.books.9780890425787
  • Fairbrother, N., & Woody, S. R. (2008). New mothers’ thoughts of harm related to the newborn. Archives of Women’s Mental Health, 11(3), 221-229. https://doi.org/10.1007/s00737-008-0016-7
  • Obsessive Compulsive Cognitions Working Group. (1997). Cognitive assessment of obsessive-compulsive disorder. Behaviour Research and Therapy, 35(7), 667-681. https://doi.org/10.1016/S0005-7967(97)00017-X
  • Purdon, C., & Clark, D. A. (1993). Obsessive intrusive thoughts in nonclinical subjects. Part I. Content and relation with depressive, anxious and obsessional symptoms. Behaviour Research and Therapy, 31(8), 713-720. https://doi.org/10.1016/0005-7967(93)90001-B
  • Rachman, S. (1997). A cognitive theory of obsessions. Behaviour Research and Therapy, 35(9), 793-802. https://doi.org/10.1016/S0005-7967(97)00040-5
  • Rachman, S., & de Silva, P. (1978). Abnormal and normal obsessions. Behaviour Research and Therapy, 16(4), 233-248. https://doi.org/10.1016/0005-7967(78)90022-0
  • Radomsky, A. S., Alcolado, G. M., Abramowitz, J. S., Alonso, P., Belloch, A., Bouvard, M., Clark, D. A., Coles, M. E., Doron, G., Fernández-Álvarez, H., Garcia-Soriano, G., Ghisi, M., Gomez, B., Inozu, M., Moulding, R., Shams, G., Sica, C., Simos, G., & Wong, W. (2014). Part 1. You can run but you can’t hide: Intrusive thoughts on six continents. Journal of Obsessive-Compulsive and Related Disorders, 3(3), 269-279. https://doi.org/10.1016/j.jocrd.2013.09.002
  • Salkovskis, P. M. (1985). Obsessional-compulsive problems: A cognitive-behavioural analysis. Behaviour Research and Therapy, 23(5), 571-583. https://doi.org/10.1016/0005-7967(85)90105-6
  • Shafran, R., Thordarson, D. S., & Rachman, S. (1996). Thought-action fusion in obsessive compulsive disorder. Journal of Anxiety Disorders, 10(5), 379-391. https://doi.org/10.1016/0887-6185(96)00018-7
  • Twohig, M. P., Hayes, S. C., Plumb, J. C., Pruitt, L. D., Collins, A. B., Hazlett-Stevens, H., & Woidneck, M. R. (2010). A randomized clinical trial of acceptance and commitment therapy versus progressive relaxation training for obsessive-compulsive disorder. Journal of Consulting and Clinical Psychology, 78(5), 705-716. https://doi.org/10.1037/a0020508
  • Wegner, D. M., Schneider, D. J., Carter, S. R., & White, T. L. (1987). Paradoxical effects of thought suppression. Journal of Personality and Social Psychology, 53(1), 5-13. https://doi.org/10.1037/0022-3514.53.1.5

Everything on this page is for educational purposes only, not for therapy, assessment, or diagnosis. Reading it does not create a counselor-client relationship. If you are in crisis right now, you can call or text 988 (the Suicide and Crisis Lifeline) for support or go to your nearest emergency department.

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