What Is OCD? A Psychiatrist’s Guide to Understanding Obsessive-Compulsive Disorder

“Most people think they know what OCD looks like: someone washing their hands until they crack, or checking a locked door a dozen times before leaving. What most people don’t see is the distress caused by the mental loop running underneath, and that’s usually the part that brings someone into my office.”

Part 1 of 3 part series. Authored by Dr. David Roth, MD, DFAACAP, FAPA, FAAP

OCD is one of the most misunderstood diagnoses I evaluate, not because it’s rare, but because what it actually looks like rarely matches what people expect. Understanding how the OCD brain is wired differently is the first step toward getting the right kind of help.

The cycle that drives OCD

Obsessive-compulsive disorder centers on a repeating loop: an intrusive, unwanted thought creates anxiety, a compulsive behavior temporarily relieves that anxiety, and the relief itself reinforces the cycle, making it more likely to happen again the next time an intrusive thought shows up.

That ”stuck” loop is the actual disorder. It’s not a personality issue or a behavior problem. OCD is a distressing, time-consuming thought, feeling, image, or compulsion that a person often recognizes as irrational even while unable to stop it. That insight, knowing the OCD doesn’t fully make sense but being unable to shake it anyway, is part of what makes it so exhausting and debilitating.

OCD often looks different than most people expect

The stereotype of OCD, visible handwashing or symmetry rituals, only describes a fraction of what I actually see. Common subtypes include:

• Contamination OCD, fear of germs or illness, often but not always paired with visible washing or cleaning rituals
• Harm OCD, intrusive fears of accidentally or intentionally hurting someone, despite having no actual desire to do so
• Checking OCD, repeated checking of locks, appliances, or one’s own actions to prevent a feared outcome
• Symmetry and “just right” OCD, distress until things feel arranged or done correctly
• Intrusive taboo thoughts, unwanted, often disturbing thoughts about violence, sexuality, or religion that the person finds deeply distressing, not desirable

A significant portion of OCD compulsions are mental rather than visible: silent counting, mental reviewing, seeking reassurance, or repeating a phrase internally. That’s part of why it goes unrecognized so often, a theme I’ll cover more directly in the next piece in this series.

How OCD differs from a personality trait

Wanting things clean, organized, or done a certain way isn’t the same as having OCD, and I think this distinction gets lost constantly in everyday language. If a preference for order is generally consistent with who someone is and it doesn’t cause significant distress, then it is a personality trait. OCD is different: it’s intrusive, unwanted, often distressing. Clinically, OCD is defined as taking more than an hour a day or causing significant distress or impairment, and for many people it takes far more and can greatly interfere with their ability to function at work, in relationships, and at school.

How I evaluate OCD

A proper evaluation goes beyond asking whether someone washes their hands a lot. I assess the actual cycle: what the intrusive thought is, what compulsion follows, how much time it consumes, and how much it interferes with daily life. We use a structured tool called the Yale-Brown Obsessive Compulsive Scale (Y-BOCS) to assess a patient’s symptom severity and track treatment progress over time.

Getting this evaluation right matters enormously, because OCD is frequently misdiagnosed as generalized anxiety, ADHD, depression, oppositional behavior, or in some cases even a psychotic disorder, especially when the compulsions are mental rather than visible. An inaccurate diagnosis leads to the wrong treatment, which wastes time that could have gone toward something that actually helps.

What comes after the diagnosis

Once we’ve confirmed OCD and measured its severity, treatment usually starts with exposure and response prevention (ERP), a specialized form of cognitive behavioral therapy, often paired with medication such as an SSRI. For adults whose symptoms persist despite those first-line treatments, we offer Deep TMS, which is FDA-cleared for OCD and works best alongside ERP. We coordinate with ERP-trained therapists across Louisville, so patients don’t have to choose between their therapist and our clinic. You can read more about how we treat OCD here.

Key takeaways

• OCD is driven by a specific cycle: intrusive thought, anxiety, compulsion, temporary relief, reinforcement
• Most OCD doesn’t look like the stereotype; contamination, harm, checking, symmetry, and intrusive taboo thoughts are all common subtypes
• Many compulsions are mental, not visible, which is a major reason OCD goes unrecognized
• OCD is distinct from a personality preference for order
• An accurate diagnosis, using tools like the Y-BOCS, is the necessary first step toward effective treatment
• Treatment typically starts with ERP and medication; FDA-cleared Deep TMS is an option for adults whose symptoms persist

Frequently asked questions

• Is OCD just about being very clean or organized? No. Cleanliness and organization can be part of certain OCD subtypes, but OCD itself is defined by the intrusive-thought-and-compulsion cycle, not by any specific theme. Many people with OCD have subtypes that have nothing to do with cleanliness at all.
• Can someone have OCD without visible rituals? Yes. Mental compulsions, like silent counting, reviewing, or reassurance-seeking, are just as real as visible ones and are often harder for others, and sometimes even the person experiencing them, to recognize as OCD.
• How is OCD officially diagnosed? Through a clinical evaluation that assesses the specific pattern of obsessions and compulsions, how much time they consume, and how much distress and impairment they cause. We use a structured tool called the Y-BOCS to evaluate and measure this.
• How is OCD treated? Most people start with exposure and response prevention (ERP) therapy, medication, or both. For adults who still have significant symptoms after those treatments, Deep TMS is FDA-cleared for OCD and is typically done alongside ongoing ERP.

If you recognize this cycle in yourself or someone you love, an accurate evaluation is the place to start. Schedule an OCD evaluation with Dr. Roth’s team.

If you're in crisis or having thoughts of harming yourself, call or text 988, the Suicide & Crisis Lifeline, anytime.