What Is Obsessive-Compulsive Disorder?

Find a therapist to treat OCD

Sexual obsessions are a common, but often overlooked, form of OCD.

So-called “pure” obsessions in OCD are typically accompanied by mental compulsions.

People with sexual OCD typically wait over a decade before receiving an accurate diagnosis.

If you ask someone to describe obsessive-compulsive disorder (OCD), most would mention hand-washing, lock-checking, or arranging things perfectly. What rarely comes to mind is the version that exists entirely inside the mind, involving thoughts so disturbing that people refuse to say them out loud.

This internal, less visible form of OCD may take the shape of taboo or intrusive thoughts.8 It is sometimes referred to as “pure OCD,” the idea that a person experiences obsessions without compulsions.10 But research suggests this is a misconception. What’s interesting is that compulsions are present, but they are internal, taking the form of mental checking and reassurance-seeking, which can be just as consuming as observable behaviors.12

In many cases, those thoughts are sexual, and sexual obsessions are among the most common forms of OCD.6 They're also the least talked about, because individuals experiencing them rarely disclose them to friends, partners, or even therapists. They’re so frequently misidentified that even mental health professionals often misinterpret taboo intrusive thoughts, contributing to delays in accurate diagnosis and treatment.6

Individuals with these types of obsessive thoughts, particularly those involving sexual themes, are more likely to anticipate rejection and experience higher levels of shame, which further delays seeking care.3, 13 On average, individuals with OCD may wait 10 to 15 years before receiving an accurate diagnosis.13

What Makes a Thought an Obsession

An intrusive thought in OCD is ego-dystonic, meaning it does not align with the person’s values, identity, or desires and is experienced as unwanted and disturbing.1 These types of thoughts feel foreign and distressing, because they are.

The distinction that needs to be made is that they are the opposite of fantasy. Whereas fantasies, even when complex, are typically experienced as intentional or welcomed, obsessions are not. They appear uninvited and may cause anxiety rather than interest or pleasure.

Now imagine that these thoughts do not occur once, but repeat continuously. The brain tends to treat this repetition as meaning; if a thought keeps returning, it begins to feel important, as though it confirms something is true. This is the core trap of OCD, in which frequency is mistaken for evidence.

In reality, the repetition is the disorder itself. The more a person tries to analyze, disprove, or suppress the thought, the more persistent it becomes—a pattern........

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