Picture someone who loses an hour every morning checking the stove, the locks and the curling iron before she can leave the house. For many people with OCD, the hardest part is not the lost time. It is the look on a spouse's face when they go back to check one more time, and the quiet assumption in that look that they could stop if they really wanted to.
That assumption is wrong, and I want to explain why from a neurologist's point of view.
How Common OCD Is
Obsessive-compulsive disorder is not a quirk or a personality type. In the National Comorbidity Survey Replication, a nationally representative survey of U.S. adults published by Ruscio and colleagues in Molecular Psychiatry (2010), 2.3 percent of adults met full diagnostic criteria for OCD at some point in their lives, and 1.2 percent had it in the prior year. More than a quarter of respondents reported having experienced obsessions or compulsions at some point, which tells you how much of this lives below the diagnostic threshold.
The casual way people use the term ("I'm so OCD about my desk") does real harm. It turns a disabling medical condition into a punchline, and it makes the people who actually have it less likely to say so.
The Brain Circuit Behind OCD
The best-studied model of OCD centers on a loop called the cortico-striato-thalamo-cortical circuit. In other words, this electrical circuit runs from the orbitofrontal cortex and anterior cingulate cortex at the front of the brain, down into the striatum (the caudate and putamen), through the thalamus, and back up to the frontal cortex. In plain language, there is a program in the brain that is constantly running in the background to be alert for things to be in order.
When I explain this to patients, I describe it as the brain's error-detection system. Its job is to notice when something is wrong, generate a feeling of unease, and then release that feeling once the problem has been handled. In OCD, imaging studies have repeatedly shown this loop to be overactive, and the "all clear" signal does not arrive. The person checks the lock, and the brain still reports that something is wrong. The compulsion brings a brief drop in anxiety, which teaches the brain that the ritual worked, and the cycle tightens.
This is why willpower alone does not resolve OCD. The person is not choosing to doubt. The circuit is generating the doubt.
Why Stress Makes OCD Worse
Many people with OCD can point to the stretch of life when their symptoms got worse: a new job, a divorce, a sick parent, a newborn at home. There is a biological reason for that pattern.
The prefrontal cortex is the part of the brain that lets us step back from a thought and decide not to act on it. Amy Arnsten at Yale, in a widely cited 2009 review in Nature Reviews Neuroscience, summarized decades of human and animal work showing that the prefrontal cortex is the brain region most sensitive to stress. Even mild, uncontrollable stress rapidly impairs prefrontal function, and prolonged stress produces structural changes in prefrontal neurons. At the same time, stress strengthens the more primitive, reactive circuits.
For someone with OCD, that is the worst possible trade. The system that applies the brakes gets weaker, the alarm gets louder, and chronic anxiety keeps the whole loop running hot. Over months and years, that state wears on sleep, concentration and mood as well.
Brain Inflammation and OCD
The most interesting finding in this area, to me, came from Jeffrey Meyer's group at the Centre for Addiction and Mental Health in Toronto. In a 2017 case-control study in JAMA Psychiatry (Attwells et al.), they used PET imaging to measure translocator protein, a marker that rises when microglia, the brain's resident immune cells, are activated. Compared with 20 healthy controls, 20 medication-free adults with OCD had translocator protein levels about 32 percent higher on average across six regions of the OCD circuit, including the orbitofrontal cortex, caudate and anterior cingulate. Higher levels in the orbitofrontal cortex tracked with more distress when patients tried to resist their compulsions.
This was a small study, and it shows an association, not proof that inflammation causes OCD. It does give us a physical marker in the exact circuit we already suspected, and it supports the idea that the inflammatory side of brain health deserves attention in OCD rather than being left out of the conversation.
What OCD Does to Relationships
OCD rarely stays inside one person. Rituals can consume hours a day, and families often get pulled in, giving reassurance on request, re-checking things, or rearranging the household to avoid triggers. Researchers call this family accommodation, and studies of OCD families have found it to be common, distressing for relatives, and associated with poorer response to treatment.
Over time, many people with OCD withdraw from friends because their rituals are hard to hide or explain. Others feel judged and pushed out. Either way the result is isolation, and isolation is another chronic stressor feeding the same circuit. Delay makes this worse: a 2015 Italian study by Dell'Osso and colleagues found an average gap of more than seven years between symptom onset and first medication treatment, and a 2023 systematic review in the Journal of Personalized Medicine linked longer untreated illness to worse long-term outcomes.
Treatment Works, and It Starts with the Basics
The encouraging part is that OCD is treatable. The FDA has approved five medications for OCD: the serotonin reuptake inhibitors fluoxetine, fluvoxamine, paroxetine and sertraline, plus the older tricyclic clomipramine. Exposure and response prevention, a structured form of cognitive behavioral therapy in which a person gradually faces triggers without performing the compulsion, has the strongest evidence of any psychotherapy for OCD, and combining it with medication often works better than either alone. For people who do not respond, deep transcranial magnetic stimulation is FDA-cleared for OCD, and we coordinate those referrals with trusted local TMS providers.
Those treatments are the foundation, and nothing we do replaces them.
How We Approach OCD at The Neurogenesis Project
What we add is a look at the whole brain the OCD circuit lives in. Poor sleep, chronic stress, metabolic problems and systemic inflammation do not cause OCD, but each of them can weaken the frontal braking system and make the alarm harder to quiet, so we look for them rather than assume they are absent.
Our Intensive Brain Health Program starts with a comprehensive evaluation that looks for those contributors, and then builds a plan to strengthen frontal function, address the drivers of inflammation, and restore sleep and stress resilience alongside standard medical therapy. NeuroCoaching, available in person or by video, gives patients a structured way to practice emotional regulation between visits. If anxiety is a large part of the picture, our page on anxiety from a neurological perspective is a good place to start.
If you are not sure whether what you are dealing with is OCD, our free two-minute OCD self-check is a reasonable place to start.
If you have been told, or have told yourself, that your OCD is a matter of willpower, I hope this changes how you see it. It is a circuit doing what it was built to do, only too loudly, and it can be brought back under control. You can schedule a visit to talk through your situation with us.
This article was drafted with the assistance of AI writing tools, then reviewed, edited, and approved by Dr. Sean C. Orr, M.D., who holds full editorial responsibility for its content. Header illustration created with AI image tools. This article is educational and is not a substitute for individual medical advice.
References
- Ruscio AM, Stein DJ, Chiu WT, et al. The epidemiology of obsessive-compulsive disorder in the National Comorbidity Survey Replication. Mol Psychiatry. 2010;15(1):53-63. doi:10.1038/mp.2008.94
- Attwells S, Setiawan E, Wilson AA, et al. Inflammation in the neurocircuitry of obsessive-compulsive disorder. JAMA Psychiatry. 2017;74(8):833-840. doi:10.1001/jamapsychiatry.2017.1567
- Arnsten AFT. Stress signalling pathways that impair prefrontal cortex structure and function. Nat Rev Neurosci. 2009;10(6):410-422. doi:10.1038/nrn2648
- Dell'Osso B, Benatti B, Oldani L, Spagnolin G, Altamura AC. Differences in duration of untreated illness, duration, and severity of illness among clinical phenotypes of obsessive-compulsive disorder. CNS Spectr. 2015;20(5):474-478. doi:10.1017/S1092852914000339
- Perris F, Cipolla S, Catapano P, et al. Duration of untreated illness in patients with obsessive-compulsive disorder and its impact on long-term outcome: a systematic review. J Pers Med. 2023;13(10):1453. doi:10.3390/jpm13101453