This entry refers to intrusive thoughts (stabbing, strangulation, etc) and impulsive thoughts.

A common misunderstanding in everyday life is that intrusive thoughts and impulsive thoughts are the same. But there is an important distinction between a thought that feels like an impulsive urge and a thought that feels like being ambushed by your own mind. I know the difference because not only have I studied it, I have lived it.

In my experience, impulsive thought feel hot and immediate, like a reckless, split-second pull to act before thinking. But an intrusive thought feels cold, sharp, and unpleasant. It drops into my head like something rotten; violent, grotesque, or just deeply wrong, and then just lingers, demanding I justify how I could have such a disgusting thought. This experience aligns with how organisations such as Mind and the NHS define intrusive thoughts: unwanted thoughts, images, or urges that are distressing, shameful, offensive, and go completely against a person’s values (Mind, n.d; NHS, 2023a).

This is why phrases like “everyone gets intrusive thoughts” can feel invalidating because, yes, technically most people experience random, unwelcome thoughts at times, and the NHS does note that almost everyone encounters unpleasant flashes now and again (NHS, 2023a). But there is a huge difference between your brain tossing out a quirky momentary image, and your mind obsessing over something dark enough to ruin your day. There is a difference between “that was odd,” and “now I am terrified of myself.” My intrusive thoughts are not curious, or in the slightest bit tempting. They feel like being cornered by something in my own mind that knows exactly what would horrify me most and then throws it at me anyway (Mind, n.d).

They are not tidy or cinematic. They arrive nasty and quick, leaving me feeling nauseous and ashamed before I have even finished the thought. Sitting behind someone who is in the way and suddenly imagining pushing them into the road. Watching someone wash a knife and instantly seeing something violent in my head. Looking at something I love and being struck with a mental image so wrong that my whole body tenses with disgust. This is the cruelty of intrusive thoughts: they do not show me what I want; they show me what would devastate me most.

Mind explains that intrusive thoughts can be especially distressing because they often go against our core beliefs and values, and the International OCD Foundation describes violent obsessions as unwanted images, thoughts, or impulses to harm that horrify the person experiencing them (Mind, n.d; International OCD Foundation, n.db)

And it’s not just the thought that is distressing, it’s the aftermath. Silent panic and private interrogation. I don’t simply just move on, I replay the thought, examining my reactions; asking why it happened, whether I seemed too calm, whether being disturbed enough proves anything, or whether being disturb enough proves something worse. It feels like cross-examining my mind in a courtroom where the evidence is a thought I never wanted. This aligns with the NHS and International OCD Foundation’s descriptions of obsessions and compulsions: the distress of the obsession pulls people into repetitive behaviours or mental rituals to seek certainty or brief relief (NHS, 2023a; International OCD Foundation, n.da).

And this is why people confusing intrusive thoughts with impulsive thoughts actually infuriates me! They do not feel the same. Impulsivity is often described as acting without thinking, or struggling with self-control, frequently in the context of ADHD (NIMH, n.d). That rings true. An impulsive thought says: “do it!” It pushes you outward. An intrusive thought whispers: “what if you did that? What if this thought shows something awful about who you are?” It doesn’t push me towards action, it traps me in fear. One is the problem of braking too late, the other is the experience of being haunted (NIMH, n.d; Mind, n.d; NHS, 2023a).

The shame makes it worse. Intrusive thoughts are often dark in the least socially acceptable ways; violent, sexual, cruel, taboo. Saying them out loud can make them seem evil, even when they are unwanted. You end up feeling contaminated by something you never chose. Mind says that people can feel deeply ashamed and scared by their intrusive thoughts, especially when they feel offensive or contrary to their identity, and this stigma can stop people from speaking about them at all (Mind, n.d; Mind, 2023). Sometimes the worst part isn’t the thought itself, but the loneliness that follows. A knowing in your chest that you can’t tell anyone, because nobody will understand.

This is also why the neat stereotype of OCD bothers me so much. People imagine clean kitchens, lined-up colours and symmetry. Meanwhile, there are people out there who are battling through their minds flashing images of harming loved ones, hurting themselves, or committing unforgivable acts and then demanding they explain why. The International OCD Foundation states that violent obsessions often involve mental images, or what feel like impulses to act, including fears of stabbing, strangling, or otherwise harming oneself or others (International OCD Foundation, n.db). This distinction matters because mistaking fear for desire risks turning someone’s worst symptom into a moral accusation.

A thought can feel personal without being true, a thought can be graphic without being a wish, a thought can arrive in my voice without belonging to me. Intrusive thoughts feel like violations, not revelations. They do not uncover a secret self, if anything, they reveal the opposite: what I value, what I fear, and how vicious anxiety can be in weaponising that. For me, the difference between intrusive thoughts and impulsive thoughts is “I need to slow down” and “I need my brain to stop showing me horrors and asking what they mean” (Mind, n.d; NHS, 2023a; International OCD Foundation, n.da).

References:

International OCD Foundation (no datea) About OCD. Available at: https://iocdf.org/about-ocd/  (Accessed: 21st March, 2026).

International OCD Foundation (no dateb) How I Treat OCD Killer Thoughts. Available at: https://iocdf.org/expert-opinions/expert-opinion-violent-obsessions/  (Accessed: 21st March, 2026).

Mind (no date) Obsessive compulsive disorder (OCD) symptoms. Available at: https://www.mind.org.uk/information-support/types-of-mental-health-problems/obsessive-compulsive-disorder-ocd/symptoms-of-ocd/ (Accessed: 21st March, 2026).

Mind (2023) OCD and stigma. Available at: https://www.mind.org.uk/information-support/types-of-mental-health-problems/obsessive-compulsive-disorder-ocd/ocd-and-stigma/ (Accessed: 21st March, 2026).

National Institute of Mental Health (no date) ADHD in Adults: 4 Things to Know. Available at: https://www.nimh.nih.gov/health/publications/adhd-what-you-need-to-know (Accessed: 21st March, 2026).

NHS (2023a) Symptoms – Obsessive compulsive disorder (OCD). Available at: https://www.nhs.uk/mental-health/conditions/obsessive-compulsive-disorder-ocd/symptoms/ (Accessed: 21st March, 2026).

NHS (2023b) Treatment – Obsessive compulsive disorder (OCD). Available at: https://www.nhs.uk/mental-health/conditions/obsessive-compulsive-disorder-ocd/treatment/  (Accessed: 21st March, 2026).