When Thoughts Feel Dangerous

Have you ever caught your mind wandering somewhere unexpected, landing on a thought you don’t agree with and didn’t invite? Does your brain ever glitch and fixate on an image that feels unsettling? These are intrusive thoughts, and they are a normal part of being human, though they can sometimes feel unsettling. Intrusive thoughts happen to everyone to some degree. You might experience a simple and harmless thought, such as the inclination to press all of the buttons in an elevator or the unexpected urge to say something inappropriate in a work meeting. For most people, these thoughts are passing. They come and go without causing much distress. For others, intrusive thoughts may contain more distressing, harm-related content involving yourself or other people. For example, this might look like an intrusive image of jumping in front of the train on your commute home. The thoughts are particularly distressing when they contradict your values, intentions, and beliefs, leading those experiencing them to try to suppress the thoughts or images. In this therapy sketch, we will be exploring harm-related intrusive thoughts and how they show up.

The Echoing Nature of Distressing Thoughts

It is natural to want to suppress the harmful thoughts that show up in us. Imagine a beach ball. You’re at North Ave beach playing around in the water with a beach ball. Think of the beach ball as an intrusive thought. If you push a beach ball underwater, it will eventually pop back up. The deeper you push, the more force the ball will launch back out of the water with. So, the more you try to suppress an intrusive thought, the more powerful it becomes, like a beach ball popping up out of the water, or a sound echoing in your brain.

The more disturbing the thought, the more inclined you are to push it away. These harm-related thoughts, when misaligned with your values, may be indicative of a form of OCD in which the obsessions center on harm, shame, and guilt, called harm obsessive-compulsive disorder (OCD). But before discussing Harm OCD specifically, it may be helpful to understand how OCD works more broadly.

What is Obsessive Compulsive Disorder?

According to the DSM-5, Obsessive Compulsive Disorder (OCD) is characterized by the presence of obsessions, compulsions, or both. Obsessions are recurring and unwanted thoughts, urges, or images that create distress or anxiety, while compulsions are repetitive behaviors or mental acts performed in an attempt to reduce distress or prevent feared outcomes.  At its core, OCD often functions like a false alarm system. Your brain identifies something as dangerous, important, or urgent (even when there is little evidence that it actually is) and then asks you to solve, prevent, or gain certainty about it.

This creates a cycle. An unwanted thought appears, the thought feels meaningful or threatening, anxiety increases, and naturally, you try to make the discomfort go away. You may analyze the thought, avoid certain situations, seek reassurance, mentally review what happened, or try not to think about it at all. While these responses often provide short-term relief, they can accidentally teach the brain that the thought truly was important in the first place. Over time, the brain begins sending the same alarm louder and more often, not because the thoughts are true, but because the brain has learned they require attention (Salkovskis, 1989).

OCD Can Show Up in Different Ways 

While OCD can involve many different themes, one way this cycle commonly shows up is through intrusive thoughts. Because intrusive thoughts are often unwanted, unexpected, and emotionally charged, the brain may mistakenly interpret them as meaningful or dangerous, causing them to receive even more attention.

What is Harm OCD specifically?

For some people, these intrusive thoughts become centered around harm. This is often referred to as Harm OCD, where obsessions frequently involve fears of causing harm to yourself or others, despite these thoughts often being deeply inconsistent with your values, intentions, and sense of self. 

Intrusive thoughts that center around harm are more common among people with OCD.  You might be wondering how OCD is clinically identified and diagnosed. How do you know if your thoughts are OCD related or rooted in actual risk? Unfortunately, there is no specific measure that tests for harm OCD. However, an equipped mental health clinician can diagnose harm OCD by evaluating the content and impact of the thoughts in general. It is not the content of the obsessive thoughts that distinguishes dangerous thoughts from harmless obsessive thoughts. Researchers argue, “the difference between normal intrusive thoughts and obsessional thoughts lies not in the content itself but in the appraisals that individuals with the disorder attach to the occurrence or content of the intrusions” (Veale et al., 2018). More simply, what does the thought mean to you? According to the answer to this question, thoughts can be identified as ego-dystonic or ego-syntonic clinically, which means:

• Ego-dystonic: the thoughts do not align with your values and are experienced as distressing and excessive
• Ego-syntonic: the thoughts feel more consistent with your values, beliefs, intentions, or sense of self (Veale et al., 2018). 

It is important to note that this distinction is not always clear-cut and should not be used as a way to self-diagnose. Rather, clinicians evaluate thoughts by considering multiple factors, including the level of distress, the presence of compulsions or avoidance behaviors, how much time the thoughts occupy, and their impact on daily functioning.

For many individuals with Harm OCD, the distress often comes from how strongly these thoughts conflict with what matters to them. They may spend significant time questioning what the thoughts mean, seeking certainty that they would never act on them, avoiding triggers, or repeatedly checking whether they are a good person.

Ironically, these attempts to gain certainty or eliminate the thoughts often strengthen the cycle, causing the thoughts to feel more frequent, more important, and more believable over time.

How to break this cycle?

While harm-related obsessions can cause great distress and contribute to engagement in excessive compulsions, it is important to know that relief is possible. Exposure and response prevention therapy (ERP) is a leading framework that is used in the treatment of all forms of OCD, including harm OCD. Through ERP, the person with OCD is supported in gradually confronting the distressing thoughts in a therapeutic space while working to avoid urges to engage in compulsions. In fact, research indicates that ERP treatment has been found to be “effective for 80% of people with OCD,” with even greater effect when paired with psychiatric medication to work towards decreasing OCD symptoms (Surles, 2025). Other modalities like Cognitive Behavioral Therapy, including Dialectical Behavioral Therapy and Acceptance and Commitment therapy, can also be used to supplement treatment for OCD.

Mindfulness is a particularly useful concept to explore in the treatment of OCD. Think back to the metaphor about the beach ball. Mindfulness looks like allowing the beach ball, or intrusive thought, to rest and float around in the water instead of giving in to the urge to push it down or suppress it. Allowing the thoughts to float without reacting to them allows them to pass with less distress. This is one way to imagine mindfulness. This idea, along with other modalities mentioned above, can be extremely effective in treating harm-related intrusive thoughts, whether you have harm OCD or not. Ultimately, it is important to know that with the right support and effort, it is possible to find ways to live with the thoughts that we can’t control.

Take-Aways

• Intrusive thoughts are a common part of human experience, though some thoughts can feel far more distressing than others. 
• Unfortunately, trying to suppress or eliminate unwanted thoughts often makes them feel louder and more frequent. 
• Harm OCD presents as ego-dystonic thoughts, meaning the thoughts rival the person’s values, beliefs, and intentions.
• Risk is about intent, not content. Regardless of how disturbing the content of the thought is, what matters is whether or not the thought reflects real harmful intent.
• Evidence-based treatments such as Exposure and Response Prevention (ERP), Cognitive Behavioral Therapy (CBT), Dialectical Behavior Therapy (DBT), and Acceptance and Commitment Therapy (ACT) may help individuals better understand intrusive thoughts, reduce compulsive responses, and develop a different relationship with uncertainty and distress.

References

Fernandez, S. J., Daffern, M., Moulding, R., & Nedeljkovic, M. (2022, November 21). Exploring predictors of aggressive intrusive thoughts and aggressive scripts: Similarities and differences in phenomenology. NIH National Library of Medicine. https://pmc.ncbi.nlm.nih.gov/articles/PMC10100145/#:~:text=Such%20an%20examination%20is%20overdue,Gilbert%20&%20Daffern%2C%202017).

Renzulli, S. (2023, August 16). Understanding the difference: Harm-related intrusive thoughts and wanting to hurt someone | Anxiety and depression association of America, ADAA. ADAA: Anxiety and Depression Association of America. https://adaa.org/learn-from-us/from-the-experts/blog-posts/consumer/understanding-difference-harm-related-intrusive 

Surles, T. (2025, August 11). Harm OCD: Symptoms, causes, and treatment. NOCD. https://www.treatmyocd.com/blog/what-is-harm-ocd-guide-to-ocd-subtype

Veale, D., Freeston, M., Krebs, G., Heyman, I., & Salkovskis, P. (2018, January 2). Risk assessment and management in obsessive–compulsive disorder | Advances in Psychiatric Treatment | Cambridge Core. Cambridge Core. https://www.cambridge.org/core/journals/advances-in-psychiatric-treatment/article/risk-assessment-and-management-in-obsessivecompulsive-disorder/B63116064047CEDFF6EB26E1D40A5638 

American Psychological Association. (n.d.). Obsessive-compulsive disorder (OCD). American Psychological Association. Retrieved June 6, 2026, from https://www.apa.org/topics/ocd 

Salkovskis P. M. (1989). Cognitive-behavioural factors and the persistence of intrusive thoughts in obsessional problems. Behaviour research and therapy, 27(6), 677–684. https://doi.org/10.1016/0005-7967(89)90152-6

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