My Brain Won't Let This Go: Is It OCD or Just Overthinking?

Jul 29

If you've ever felt like your brain just won't let something go, you're not alone.

Most people don't walk into my office saying, "I think I have obsessive-compulsive disorder." They say things like, "I can't stop thinking," "My brain won't let this go," "I know it doesn't make sense, but I can't convince myself everything is okay," or "I just need to figure this out."

Eventually, many people begin wondering whether they're simply overthinking or if something more is going on. They start searching for answers, reading articles, watching videos, taking online quizzes, and comparing their experiences to stories they've seen online. Unfortunately, that often creates even more confusion. OCD is frequently portrayed as a disorder of organization, cleanliness, or quirky habits, while other explanations become so technical that it's difficult to recognize yourself in what you're reading.

The reality is much simpler.

At its core, OCD is a disorder that keeps people stuck in an endless search for certainty.

Once you understand that, the rest of the disorder begins to make a lot more sense.

What Is the Difference Between Overthinking and OCD?

The word “overthinking” gets used all the time, but it isn't actually a mental health diagnosis. It's simply a way of describing the experience of thinking about something longer than feels helpful. Nearly everyone has replayed an awkward conversation, second-guessed an important decision, or stayed awake wondering how something is going to turn out. Eventually, though, most people make a decision, accept that they don't have every answer, or simply move on.

OCD looks different.

The goal is no longer to solve a problem. Instead, your brain becomes convinced that you have to eliminate uncertainty before you can move forward. The harder you work to find certainty, the more uncertain you begin to feel. Rather than arriving at an answer that allows you to move on, you find yourself asking the same questions over and over again.

One of the simplest ways I explain this to clients is this:

Overthinking tries to solve a problem. OCD tries to eliminate uncertainty.

That difference changes everything.

Years ago, I heard someone describe OCD as an intolerance of uncertainty. Of all the ways I've heard OCD explained over the years, that's the one that has stayed with me the most. It doesn't mean people with OCD can't tolerate uncertainty. It means their brain works incredibly hard to get rid of it.

The problem is that life doesn't offer certainty very often, no matter how badly we want it.

We can't know with absolute certainty that we'll never make a mistake, offend someone, become sick, choose the wrong career, or have another uncomfortable thought. Most of us eventually learn to live alongside those unknowns. OCD says we can’t live like that.

Understanding OCD: The O, the C, and the D

When I explain OCD to clients, I usually tell them to forget the complicated definitions for a moment and simply look at the three letters in its name.

The O Stands for Obsessions

Obsessions are intrusive thoughts, images, urges, sensations, or doubts that repeatedly enter your mind and feel unwanted. They often create anxiety, guilt, shame, disgust, or a powerful feeling that something is unresolved. Although the content of obsessions varies from person to person, they almost always leave someone feeling as though they need to do something to make the discomfort go away.

The C Stands for Compulsions

Compulsions are the things we do to reduce anxiety, become more certain, or prevent something bad from happening. Some compulsions are visible, like checking, washing, arranging, or repeating behaviors. Others happen entirely inside the mind.

Someone with OCD may spend hours replaying a conversation to make sure they didn't say something offensive. They may mentally review memories to convince themselves they didn't do something wrong, repeatedly Google the same question, compare themselves to other people, check how they feel, or ask loved ones for reassurance. From the outside, it may simply look like they're thinking. Inside, they're performing compulsions that are every bit as exhausting as the ones you can see.

The D Stands for Disorder

This part matters because almost everyone experiences intrusive thoughts from time to time. Most people also have routines, habits, or moments when they overthink something. Those experiences alone don't mean someone has OCD.

For OCD to be considered a disorder, the obsessions and compulsions become time-consuming, create significant distress, or interfere with important parts of life like work, school, relationships, parenting, sleep, or simply being present in everyday moments.

That's what separates having an intrusive thought from becoming trapped in the obsessive-compulsive cycle.

The Biggest Misconception About OCD

One of the biggest misconceptions about OCD is that it's defined by the content of a person's thoughts. I'm here to tell you that it isn't. People without OCD have disturbing, violent, sexual, blasphemous, or otherwise bizarre intrusive thoughts, too. The difference isn't whether the thought appears. The difference is what happens after it appears.

Imagine two people have the exact same intrusive thought.

One person notices it, thinks, "Well, that was strange," and goes back to making dinner.

The other person's brain immediately sounds an alarm.

"Why did I think that?"

"Does this mean something about me?"

"What if this thought is true?"

"I need to figure this out."

From that point on, the brain begins searching for certainty. It reviews memories, analyzes emotions, searches online, seeks reassurance, compares experiences, or mentally argues with the thought in an attempt to prove everything is okay.

Unfortunately, every attempt to prove everything is okay teaches the brain that the thought must have been important in the first place. Instead of resolving the anxiety, it teaches the brain to pay even more attention to the thought. The cycle grows stronger, the next intrusive thought feels even more urgent, and the search starts all over again.

Eventually, the search itself becomes the problem.

Why OCD Feels So Convincing

If you've never experienced OCD, it can be difficult to understand why someone can't simply "let it go." If you have experienced OCD, you've probably wondered the same thing yourself.

The reason OCD feels so convincing is because it targets the things that matter most to you. It doesn't usually attack your favorite color or whether you remembered to buy paper towels. Instead, it latches onto your values, your relationships, your health, your faith, your safety, or your identity.

The more important something is to you, the more convincing the doubt becomes.

Imagine you're buying a car. It makes sense to ask questions, do your research, and think carefully before making such a significant decision. At some point, though, you have to make the best decision you can without knowing exactly how the future will unfold.

That's how life works, but OCD doesn't like that answer.

Instead, it tells you to keep thinking. Keep reviewing. Keep checking. Keep searching until you're completely certain. The problem, of course, is that certainty never arrives. Your brain concludes that you simply haven't thought hard enough yet, so the cycle starts all over again. It's exhausting.

"What If I'm the Exception?"

If you've been reading this article and thinking, "This sounds a lot like me," there's a decent chance another thought showed up right behind it.

"Yeah...but what if I'm the exception?"

"What if everyone else with OCD worries like this, but my situation is actually different?"

"What if this article doesn't apply to me?"

I've had countless clients describe this exact experience. Does having those thoughts automatically mean you have OCD? No. But it does illustrate something important about how OCD operates.

OCD doesn't usually argue by telling you that something is definitely true (since that would be certainty).

Instead, it whispers:

"But...what if?"

The problem is that there's no "good enough" answer to a “what-if” question. Every answer creates another question. Every reassurance eventually wears off. Every Google search leads to another article. The search to prove things are okay becomes endless, leaving people mentally drained without ever feeling truly satisfied with the answer.

If you remember one thing from this section, let it be this:

OCD isn't a disorder of bizarre thoughts. It's a disorder of getting stuck in the search for certainty.

In the next section, we'll look at what OCD can actually look like in everyday life, including many of the common OCD themes that people often don't recognize as OCD.

What OCD Can Actually Look Like

By this point, you may be thinking this sounds familiar but your thoughts have nothing to do with germs or checking locks. Fair - and if that's what you're thinking, you're far from alone.

One of the biggest misconceptions about OCD is that it always looks the same. When most people picture OCD, they imagine someone washing their hands repeatedly, checking that the stove is off, or arranging objects until they feel "just right." While those are certainly common ways OCD can present, they're only part of the picture.

Remember, OCD isn't defined by the content of a person's thoughts. It's defined by the pattern we've been talking about throughout this article. An intrusive thought or doubt appears, anxiety follows, and the brain begins searching for certainty. The theme may change from one person to another, but the cycle stays remarkably consistent.

Below are some of the most common OCD themes. As you read through them, you may recognize yourself in one of them, several of them, or none of them. That's okay. OCD can attach itself to almost anything, so this isn't intended to be an exhaustive list.

Some of the Most Common OCD Themes

Relationship OCD (ROCD)

Relationship OCD goes far beyond the normal uncertainty that exists in every relationship. Instead, the brain becomes convinced it needs complete certainty about your relationship, your feelings, or your partner's feelings. Compulsions often include checking your emotions, replaying conversations, comparing your relationship to others, researching relationships, or seeking reassurance from loved ones.

Harm OCD

People with Harm OCD experience intrusive fears about causing harm to themselves or someone else, despite having no desire to do so. Because these thoughts feel so disturbing, they may avoid certain situations, mentally review their intentions, repeatedly check that everyone is safe, or seek reassurance that they would never act on the thoughts.

Postpartum OCD

Many new parents experience intrusive thoughts after the birth of a baby. For someone with Postpartum OCD, however, those thoughts become relentless, distressing, and incredibly difficult to dismiss. A parent may experience unwanted thoughts or images about accidentally or intentionally harming their baby, despite loving their child deeply and wanting to protect them above all else. Because these thoughts feel so frightening, they may avoid certain caregiving tasks, mentally review their actions, seek reassurance, or keep the thoughts secret out of fear that someone will misunderstand them.

It's important to know that Postpartum OCD is a well-recognized presentation of OCD, and these intrusive thoughts are not a reflection of a parent's character, intentions, or desire to harm their child.

Contamination OCD

Contamination OCD isn't just about germs. It can involve fears of illness, chemicals, bodily fluids, mold, medications, environmental toxins, or accidentally contaminating someone else. Common compulsions include excessive washing, cleaning, avoiding certain places or objects, or following elaborate routines designed to prevent contamination.

Health OCD

Health OCD centers on the overwhelming need to become certain that nothing serious has been overlooked. People often find themselves repeatedly Googling symptoms, examining their body, questioning medical tests, seeking reassurance, or wondering whether a physician missed something important.

Religious OCD (Scrupulosity) and Moral OCD

For some people, OCD attaches itself to religion. For others, it attaches itself to morality. Someone may become consumed by fears of offending God, committing a sin, praying incorrectly, questioning whether they're a "good enough" person, or wondering if they've accidentally harmed someone emotionally. Compulsions often involve repeated prayer, confession, apologizing, reassurance seeking, or endless mental review.

Sexual Orientation OCD (SO-OCD)

Sexual Orientation OCD is not about exploring or discovering one's identity. Instead, it's driven by the need to become completely certain about one's sexual orientation. Compulsions often include monitoring attraction, comparing yourself to others, mentally reviewing past experiences, or seeking reassurance.

Pedophilia OCD (P-OCD)

People with P-OCD experience intrusive fears that they might be sexually attracted to children, despite finding those thoughts horrifying and completely inconsistent with who they are. Compulsions commonly include avoiding children, monitoring physical reactions, mentally reviewing memories, researching intrusive thoughts, or seeking reassurance.

False Memory OCD and Real Event OCD

Some people become trapped by uncertainty about the past. They may worry they've forgotten doing something terrible or become consumed by something that actually happened years ago, desperately trying to determine what it means about who they are. Compulsions often involve reviewing memories, confessing, researching, or seeking reassurance.

Existential OCD

Existential OCD centers on life's biggest questions, such as reality, consciousness, free will, death, or the meaning of life. Unlike philosophical curiosity, these questions feel urgent and impossible to set aside, leading to endless mental debate and searching for answers that finally feel certain.

Sensorimotor OCD

Sensorimotor OCD involves becoming hyperaware of normal bodily sensations like breathing, blinking, swallowing, or your heartbeat. The more someone tries to stop noticing these sensations, the more attention their brain gives them, leading to constant monitoring and frustration.

The Most Annoying Party Guest

One way I often explain this to clients is to imagine OCD showing up in costume to a party. It gets bored so it leaves and comes back wearing a different costume. One time it arrives dressed as contamination, another time it might be wearing a relationship costume, and later it may show up disguised as guilt over something that happened years ago or fear about your health. The costume changes, but underneath it all, it's still OCD.

That's the important takeaway from this analogy. If we spend all our time focusing on the costume, we miss the fact that it's the same annoying guest returning to the party over and over again.

That's why treatment isn't about solving every individual fear. If you prove one obsession wrong, OCD often finds another costume to wear. The goal isn't to defeat one theme after another. It's to recognize the pattern underneath them all and change your relationship with the obsessive-compulsive cycle itself.

Many people experience more than one OCD theme over the course of their lives, and it's common for OCD to shift from one topic to another over time. The theme may change, but the obsessive-compulsive cycle stays incredibly consistent.

By now, you may have recognized yourself in one or more of these themes. You also may have noticed that the themes themselves aren't really the important part. Beneath every obsession is the same search for certainty, and beneath every compulsion is the hope that certainty will finally bring relief. Unfortunately, that's exactly what keeps OCD alive.

In the next section, we'll look at why compulsions and reassurance seem to work in the moment, but ultimately strengthen the very cycle they're trying to break.

Why Compulsions Feel Helpful (But Aren't)

By now, you may recognize the obsessive-compulsive cycle and even see yourself in one or more of the themes we've discussed. That awareness is an important first step, but it also leads to a question I hear from clients all the time:

"If I know this is OCD, why is it still so hard to stop?"

The answer has less to do with the intrusive thoughts themselves and more to do with what happens after them.

Every time OCD convinces you to seek reassurance, replay a memory, Google another symptom, check your body, avoid a situation, or mentally argue with a thought, your anxiety usually decreases, at least for a little while. That relief feels good, and it makes perfect sense why your brain would want to repeat something that temporarily reduces discomfort.

The problem is that your brain begins to associate compulsions with safety. Instead of learning that uncertainty is uncomfortable but manageable, it learns that uncertainty needs to be eliminated. Over time, the compulsions become stronger, more frequent, and more convincing because they've been repeatedly reinforced.

This is also why reassurance rarely works for very long. Whether it comes from a loved one, a therapist, your physician, Google, or even your own mind, reassurance usually provides temporary relief at best. Before long, another doubt appears, another question surfaces, and your brain wonders if there was something you overlooked. The relief fades, and the cycle begins again.

The Goal Isn't to Stop Having Intrusive Thoughts

One of the biggest misconceptions about OCD treatment is that the goal is to stop having intrusive thoughts altogether. This isn’t the goal. Remember how we talked about intrusive thoughts being a normal part of being human? People without OCD have strange, unwanted, and even disturbing thoughts, too. The difference isn't whether the thoughts occur. The difference is how much meaning we assign to them and how much time we spend trying to make them go away.

Recovery doesn't come from learning how to control every thought that enters your mind. It comes from learning that you don't have to respond to every thought that asks for your attention.

That's often one of the hardest shifts for people with OCD. The brain has spent months, years, or even decades believing every thought or doubt deserves an answer. Treatment helps you discover that not every question needs to be solved in order to live a meaningful life.

How Exposure and Response Prevention (ERP) Helps

Exposure and Response Prevention (ERP) is considered the gold-standard treatment for OCD because it targets the very cycle that keeps the disorder going.

You may hear therapists describe ERP as an evidence-based treatment, which simply means it has been studied extensively in scientific research and consistently shown to be effective. Rather than relying on intuition or tradition alone, evidence-based treatments are supported by decades of research demonstrating that they help people recover.

Despite what many people imagine, ERP isn't about forcing someone into their worst fear or overwhelming them with anxiety. A thoughtful ERP therapist works collaboratively with you to create exposures that are manageable, purposeful, and connected to the life you want to get back to.

The exposure part of ERP involves intentionally approaching the thoughts, situations, images, or sensations that OCD has taught you to fear or avoid. The response prevention part involves resisting the urge to perform the compulsions that would normally follow. Depending on the person, that might mean choosing not to seek reassurance, resisting the urge to Google, allowing questions to remain unanswered, or noticing an intrusive thought without trying to analyze it.

At first, this feels uncomfortable, but that’s what needs to happen to help rewire your brain. You're asking it to learn something it has spent a long time trying to avoid. With practice, you learn to get comfortable with discomfort. From there, your brain gradually learns that anxiety rises and falls on its own and that compulsions aren't actually necessary to stay safe. Little by little, the obsessive-compulsive cycle begins to lose its grip.

What I Hope You Take Away

If you've recognized yourself anywhere in this article, I hope you leave with more than just information. I hope you leave knowing that you're not alone.

Over the years, I've sat with countless people who believed they were the only one having these thoughts. They were convinced their situation was somehow different, that if they could just think a little harder, research a little longer, or finally find the right answer, everything would click into place. That's the trap OCD sets.

And if you've found yourself caught in that trap, I hope you'll also hear this: you're not broken, and you're certainly not beyond help.

One of the hardest realities about OCD is that many people spend years in therapy without ever receiving treatment that directly targets the disorder. They gain insight into themselves, learn where their anxiety may have come from, and understand their experiences more deeply, yet they still find themselves stuck in the same obsessive-compulsive cycle because that cycle was never actually addressed.

Insight is valuable, but insight alone isn't what breaks OCD. That's why evidence-based treatment matters.

Exposure and Response Prevention (ERP), often combined with approaches like Acceptance and Commitment Therapy (ACT), helps people change their relationship with uncertainty rather than continuing the exhausting search to eliminate it. Decades of research have shown that these approaches work, and every day I watch people begin reclaiming parts of their lives they thought OCD had taken from them forever.

What Now?

Whether OCD has attached itself to your health, your relationships, your faith, your identity, your baby, or something else entirely, the theme isn't what keeps you stuck. It's the cycle.

And cycles can be broken.

You don't have to wait until you feel less anxious or more "ready" to begin – and you certainly don't have to figure this out on your own. If this article felt familiar, know that you don't have to figure this out on your own. OCD is highly treatable, and with the right evidence-based support, people recover every day.

If you're looking for compassionate, evidence-based OCD treatment in Illinois, West Suburbs OCD and Mental Health would be honored to help. Feel free to reach out to learn more or schedule a consultation.

Contact West Suburbs OCD and Mental Health

Evidence-Based Resources

This article was written using current evidence-based research and established clinical guidelines for the assessment and treatment of Obsessive-Compulsive Disorder. The following resources informed the concepts discussed throughout this guide.

Abramowitz, J. S. (2006). Understanding and Treating Obsessive-Compulsive Disorder: A Cognitive Behavioral Approach. Lawrence Erlbaum Associates.
Abramowitz, J. S., McKay, D., & Taylor, S. (Eds.). (2008). Clinical Handbook of Obsessive-Compulsive Disorder and Related Problems. Johns Hopkins University Press.
American Psychiatric Association. (2022). Diagnostic and Statistical Manual of Mental Disorders (5th ed., text rev.; DSM-5-TR). American Psychiatric Association Publishing.
Foa, E. B., Yadin, E., & Lichner, T. K. (2021). Exposure and Response (Ritual) Prevention for Obsessive-Compulsive Disorder: Therapist Guide (2nd ed.). Oxford University Press.
Grayson, J. (2004). Freedom from Obsessive Compulsive Disorder. Berkley Books.
International OCD Foundation. (n.d.). International OCD Foundation. https://iocdf.org
National Institute of Mental Health. (n.d.). Obsessive-Compulsive Disorder.https://www.nimh.nih.gov/health/topics/obsessive-compulsive-disorder-ocd
Pittenger, C. (Ed.). (2017). Obsessive-Compulsive Disorder: Phenomenology, Pathophysiology, and Treatment. Oxford University Press.
Salkovskis, P. M. (1985). "Obsessional-Compulsive Problems: A Cognitive-Behavioural Analysis." Behaviour Research and Therapy, 23(5), 571–583.
Twohig, M. P., & Levin, M. E. (2017). "Acceptance and Commitment Therapy as a Treatment for Anxiety and Depression: A Review." Psychiatric Clinics of North America, 40(4), 751–770.
Winston, S., & Seif, M. (2017). Needing to Know for Sure: A CBT-Based Guide to Overcoming Compulsive Checking and Reassurance Seeking. New Harbinger Publications.

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Lora Dudek