What Is “Pure O” OCD? The Hidden Compulsions No One Sees

Written By Hailee Dear

Many people believe OCD is only about visible behaviors—like hand washing or checking. But for some, the compulsions are entirely internal. This is often referred to as “Pure O” OCD.

What Is Pure O?

“Pure O” stands for “purely obsessional” OCD, but the name is misleading. Compulsions are still present—they’re just mental.

Common Mental Compulsions

  • Mental reviewing (“Did I mean that?”)

  • Reassuring yourself internally

  • Replaying conversations

  • Trying to “figure it out”

  • Praying or neutralizing thoughts

Because these happen internally, they often go unnoticed—leading people to feel confused or misdiagnosed.

Why It Feels So Real

Mental compulsions keep the brain engaged with the thought, making it feel more urgent and meaningful.

Treatment

ERP for Pure O focuses on:

  • Not engaging with mental rituals

  • Allowing uncertainty

  • Breaking the need to “solve” the thought

Hailee Dear
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Why Do I Keep Having Intrusive Thoughts? Understanding the OCD Cycle