Understanding OCD: A Clinical Psychologist’s Perspective
Evidence-based psychoeducation about Obsessive-Compulsive Disorder — what it is, how it works, and how it can be treated.
What Is OCD?
Obsessive-Compulsive Disorder (OCD) is a recognised mental health condition characterised by two core features: obsessions and compulsions. It is not a personality quirk, a preference for tidiness, or a sign of weakness. OCD is a clinically significant anxiety-based condition that can be highly distressing and interfering with daily life.
OCD affects approximately 1–2% of the population and can present at any age, though onset is most common in childhood, adolescence, or early adulthood. It affects people of all genders, backgrounds, and neurotypes.
Despite its portrayal in popular culture, OCD is rarely about cleanliness or organisation. It is a deeply distressing condition driven by fear, doubt, and the exhausting cycle of trying to feel certain or safe.
Obsessions and Compulsions Explained
🔁 Obsessions
Obsessions are unwanted, intrusive thoughts, images, urges, or doubts that repeatedly enter the mind and cause significant distress or anxiety. They are ego-dystonic — meaning they feel alien, wrong, or deeply at odds with the person’s values and sense of self.
Common themes include:
- Fear of contamination or spreading illness
- Intrusive thoughts about harming oneself or others
- Fears about acting against one’s moral or religious values
- Doubt about whether something was done correctly (e.g. locking the door)
- Unwanted sexual thoughts or images
- Fear of losing control
- Symmetry, exactness, or “just right” feelings
🛡️ Compulsions
Compulsions are repetitive behaviours or mental acts performed in response to an obsession, usually to reduce distress, prevent a feared outcome, or achieve a sense of completeness. They provide temporary relief, but ultimately maintain and strengthen the OCD cycle.
Common compulsions include:
- Excessive washing, cleaning, or sanitising
- Checking (locks, appliances, switches)
- Counting, tapping, or repeating actions a set number of times
- Seeking reassurance from others
- Mental reviewing or replaying events
- Avoiding triggering situations or objects
- Arranging objects until they feel “just right”
The OCD Cycle: How It Maintains Itself
One of the most important things to understand about OCD is that compulsions, while temporarily relieving, make OCD worse over time. This is because they reinforce the belief that the obsession was genuinely dangerous, and that the compulsion was necessary to prevent harm.
The OCD cycle typically follows four stages:
1. Intrusive Thought
An unwanted thought, image, or urge enters the mind — often distressing and seemingly out of nowhere.
2. Anxiety & Distress
The thought is appraised as meaningful or dangerous, triggering significant anxiety, guilt, or dread.
3. Compulsion
A behaviour or mental act is performed to neutralise the anxiety or prevent the feared outcome.
4. Temporary Relief
Anxiety reduces briefly, reinforcing the compulsion and making the obsession more likely to return.
Breaking this cycle is the core goal of evidence-based OCD treatment. The key insight is that the thought itself is not the problem, it is the meaning attached to it and the response to it that drives OCD.
Intrusive Thoughts: What You Need to Know
Research shows that over 90% of people experience intrusive thoughts (unwanted, distressing thoughts that pop into the mind unbidden). The difference between someone with OCD and someone without is not the presence of intrusive thoughts, but how those thoughts are interpreted.
In OCD, intrusive thoughts are appraised as highly significant, dangerous, or revealing something true about the person. This appraisal, not the thought itself, is what generates distress and drives compulsive behaviour.
Important: Having an intrusive thought does not mean you want to act on it.
People with OCD often experience profound shame and guilt about their intrusive thoughts, particularly when they involve harm, sexuality, or religion. It is clinically important to understand that the distress caused by these thoughts is itself evidence that they are contrary to the person’s values. OCD tends to target the things people care about most.
Common Presentations of OCD
OCD can present in many different ways. Below are some of the most recognised subtypes — though it is important to note that OCD often overlaps across themes and does not fit neatly into categories.
🧼 Contamination OCD
Fear of germs, illness, or contamination, leading to excessive washing, cleaning, or avoidance of perceived contaminants.
🔒 Checking OCD
Repeated checking of locks, appliances, or actions due to intense doubt and fear of causing harm through negligence.
💭 Pure O (Purely Obsessional)
OCD with predominantly mental compulsions, ruminating, reviewing, reassurance-seeking mentally, often around harm, sexual, relationships or religious themes.
✝️ Scrupulosity OCD
Obsessions centred on religious, moral, or ethical themes, fear of sinning, blasphemy, or acting against deeply held values.
📐 Symmetry & “Just Right” OCD
Driven by an uncomfortable sense that things are not “just right”, leading to ordering, arranging, or repeating until the feeling resolves.
👶 Perinatal OCD
Onset or worsening of OCD during pregnancy or the postnatal period, often involving intrusive thoughts about harming the baby, which cause immense distress.
OCD and Neurodiversity
OCD frequently co-occurs with neurodevelopmental conditions such as ADHD and autism. Understanding this overlap is essential for accurate formulation and effective treatment.
OCD & Autism
Repetitive behaviours in autism (e.g. stimming, routines) can look similar to compulsions but serve a different function, they are often regulating and enjoyable, not driven by anxiety. Careful assessment is needed to distinguish OCD from autistic traits, as treatment approaches differ significantly.
OCD & ADHD
ADHD and OCD can co-occur, and be routed in individuals’ desire to manage inattention. ADHD-related impulsivity and distractibility can complicate OCD treatment, and the mental effort required to manage OCD compulsions can be particularly exhausting for those with attentional difficulties.
Evidence-Based Treatment for OCD
OCD is a treatable condition. With the right support, the vast majority of people with OCD experience significant improvement. NICE guidelines recommend two first-line treatments:
ERP — Exposure and Response Prevention
ERP is the gold-standard psychological treatment for OCD. It involves gradually and systematically exposing the person to feared thoughts or situations, whilst resisting the urge to perform compulsions. Over time, this teaches the brain that the feared outcome does not occur and that anxiety naturally reduces without compulsions.
ERP is conducted collaboratively, at a pace that feels manageable, and always with the client’s informed consent and active involvement.
CBT AND ACT for OCD
Cognitive Behavioural Therapy for OCD focuses on identifying and challenging the unhelpful appraisals that give intrusive thoughts their power. This includes working with beliefs about responsibility, the importance of thoughts, the need for certainty, and perfectionism.
CBT and ERP are often used together, and can be adapted for children, young people, and those with co-occurring neurodevelopmental conditions.
Additional Approaches
- ACT (Acceptance and Commitment Therapy) — developing psychological flexibility and reducing the struggle with intrusive thoughts
- Inference-Based CBT (I-CBT) — particularly useful for OCD driven by “what if” doubts and overactive imagination
- EMDR and TF-CBT — OCD can often be the result of traumatic experience and therefore, processing trauma can help recover from OCD.
- Family and systemic work — supporting family members to avoid inadvertently accommodating OCD, which can maintain the cycle
OCD Therapy at Reframe Psychology
At Reframe Psychology, our clinical psychologists offer specialist, evidence-based therapy for OCD across the lifespan. We work with adults, young people, and families, and we have particular experience supporting autistic and ADHD individuals with OCD. We understand trauma as an important factor and our approach is trauma-focussed.
Our approach is:
- Compassionate and non-judgmental — we understand that OCD content can feel deeply shameful, and we create a safe space for honest exploration
- Evidence-based — grounded in NICE-recommended treatments including ERP and CBT, with the ability to use integrative and trauma-focussed approach to support treatment
- Individually tailored — adapted to your specific presentation, neurotype, and goals
- Collaborative — you are an active participant in your treatment at every stage
- Neurodiversity-informed — we understand the overlap between OCD and neurodivergence
Ready to Take the Next Step?
You do not have to manage OCD alone. Our specialist team is here to help you understand your OCD and work towards a life less controlled by it — with compassion, expertise, and evidence-based care.