Intrusive thoughts: a plain-language definition

Definition

What intrusive thoughts means

Intrusive thoughts are unwelcome thoughts, images, or urges that pop into the mind on their own. They can be disturbing, violent, sexual, or simply odd, and they tend to clash with a person's values, which is part of why they feel so unsettling. They arrive uninvited and against your wishes. Nearly everyone has them; surveys find that the vast majority of people experience occasional intrusive thoughts without any disorder.

In practice the thought itself is rarely the problem. What matters is the reaction to it. Most people have a strange or unwanted thought, register that it is just a thought, and let it pass. The difficulty begins when a person treats the thought as meaningful, dangerous, or a sign of who they really are, and then tries hard to suppress or neutralize it. That effort tends to make the thought louder and more frequent.

This matters because intrusive thoughts are the obsessions at the heart of obsessive-compulsive disorder. In OCD they become repetitive and intensely distressing, and the person performs compulsions, mental or physical rituals, to relieve the anxiety they cause. They also appear in anxiety disorders, depression, and post-traumatic stress. The treatment that works best, exposure and response prevention plus SSRIs, helps a person let the thoughts come without acting on them, which drains their power.

A common misconception is that having a disturbing intrusive thought means a person secretly wants to act on it or is a bad person. The opposite is usually true; the distress comes precisely because the thought is so against their values. Another misread is that the goal of treatment is to never have the thoughts again. The realistic and effective aim is to change the relationship to them so they no longer hijack the day.