OCD Therapy Assessment

OCD is a thief.

It steals time, attention, sleep, intimacy, certainty, and — quietly, over years — the version of yourself you were meant to become.

You probably already know that what you're dealing with isn't logical. That's part of what makes it so exhausting. The part of you that knows the thoughts aren't true is in a constant, draining argument with the part of you that can't quite let them go. The checking. The mental reviewing. The asking for reassurance and the second-guessing of the reassurance. The avoidance of triggers that didn't used to be triggers.

You've probably tried to think your way out of it. You may have tried CBT that didn't quite land. You may have spent years not telling anyone the actual content of your thoughts because the content itself feels unspeakable.

We get it. And we know what to do with it.

What Is OCD?

Obsessive-Compulsive Disorder (OCD) is a mental health condition characterised by intrusive, unwanted thoughts, images or urges (obsessions) and the repetitive mental or physical actions performed to neutralise them (compulsions). OCD affects around 1.2% of the UK population — roughly 750,000 people — according to OCD-UK and the Royal College of Psychiatrists. The World Health Organization lists OCD among the ten most disabling conditions globally.
OCD is highly treatable. With the right evidence-based therapy, most people experience significant, lasting reduction in symptoms.

"OCD isn't a thinking problem. It's a relationship-to-thinking problem. The content of the thoughts almost doesn't matter — what matters is that the brain has learned to treat certain thoughts as urgent and certain rituals as protective. Therapy is the process of unlearning both."
— Albie Mew-Davies, MBACP · Co-founder & Clinical Lead

OCD vs Anxiety: What's the Difference?

OCD and anxiety often overlap and are frequently confused. They're related — OCD is sometimes classified as an anxiety disorder — but they're treated differently, and the distinction matters.

Obsessive-Compulsive Disorder (OCD)

• Core mechanism — Specific intrusive thoughts followed by ritualised attempts to neutralise them.

• Themes — Often disturbing, taboo, or out-of-character (harm, contamination, sexuality, religion).

• Compulsions — Present, physical or mental, performed to reduce distress.

• Response to reassurance — Provides brief relief, then makes it worse.

Generalised anxiety

• Core mechanism — Persistent, free-floating worry across multiple life areas.

• Themes — Real-life concerns (work, money, health, relationships).

• Compulsions — Generally absent; worry itself is the main symptom.

• Response to reassurance — Usually provides genuine, lasting reassurance.

If you're not sure which fits, that's normal. Many people have both. A proper assessment will clarify it. See our anxiety therapy page for more on how we treat anxiety specifically.

What Causes OCD?

OCD is caused by a combination of genetic, neurobiological and environmental factors — not a single cause. Twin studies estimate genetic heritability at around 45–65%. Brain imaging consistently shows differences in the neural circuits that regulate repetitive behaviours. Stressful life events, trauma and infections can trigger OCD onset in people who are biologically vulnerable.

What this means in practice: OCD is not caused by being weak, anxious, perfectionist, or "neurotic." It is not caused by anything you did, thought, or failed to do. It's a recognised neurobiological condition with effective evidence-based treatment.

The Cycle of OCD

OCD runs on a predictable loop. Every OCD presentation, no matter the theme, follows this structure:

1. Trigger — something internal (a thought, image, sensation) or external (a person, place, object) activates the system.

2. Obsession — an intrusive thought, image or urge appears. It feels significant, threatening, or wrong.

3. Anxiety — distress spikes. The brain treats the thought as a real problem that needs solving.

4. Compulsion — you do something — physical or mental — to reduce the distress. Wash. Check. Pray. Mentally review. Seek reassurance. Avoid.

5. Temporary relief — the anxiety drops. Briefly.

6. The loop tightens — the brain learns that the compulsion is what kept you safe, so next time the thought appears, the urge to compulse is stronger.

Every time you complete the loop, you teach the brain that the original thought was dangerous and the compulsion was necessary. Therapy is the process of breaking the loop — safely, gradually, with full understanding of what you're doing and why.

Types of OCD We Treat: At a Glance

OCD shows up in many forms. The themes vary, but the underlying mechanism — intrusive thought, anxiety, compulsion, relief — is the same. Treatment is tailored to the specific subtype.

• Pure O — Mostly mental compulsions, often around taboo themes. Key compulsions: silent reassurance, mental reviewing, internal rituals.

• Harm OCD — Fear of harming yourself or others. Key compulsions: avoidance, mental checking, hiding "dangerous" objects.

• Relationship OCD (ROCD) — Persistent doubt about a relationship or partner. Key compulsions: comparing, mental analysis, reassurance-seeking.

• Sexual Orientation OCD (SO-OCD) — Intrusive doubts about sexual orientation. Key compulsions: mental testing, monitoring reactions, avoidance.

• Religious / Scrupulosity OCD — Fear of sin, blasphemy, moral failure. Key compulsions: excessive prayer, confession, mental rituals.

• Contamination OCD — Fear of germs, dirt, illness. Key compulsions: washing, cleaning, avoidance, decontamination.

• Checking OCD — Fear of being responsible for catastrophe. Key compulsions: repeatedly checking locks, appliances, work, body.

• Symmetry / "Just Right" OCD — Need for things to feel correct or balanced. Key compulsions: repeating, counting, ordering, until it "clicks."

• Health OCD — OCD attached to health themes. Key compulsions: body-scanning, Googling, medical reassurance.

Each subtype is covered in more detail below.

Pure O (Pure Obsessional OCD)

Pure O is OCD where the compulsions are mostly mental — internal reviewing, silent reassurance, mental rituals — rather than visible behaviours. The intrusive thoughts often involve violent, sexual, religious or taboo content that feels deeply at odds with who you are. The term is slightly misleading (there are almost always compulsions; they're just invisible), but it's a recognised and treatable presentation, and one of the most common subtypes we see. Pure O is one of the most common — and most misunderstood — OCD presentations.

Harm OCD

Harm OCD involves intrusive thoughts about harming yourself or others, usually someone you love. These thoughts are profoundly distressing precisely because they go against your values. Harm OCD is not a sign you're dangerous. Research is clear: people with Harm OCD have the same actual risk of acting on these thoughts as anyone in the general population.

Relationship OCD (ROCD)

ROCD is persistent doubt about your partner, your feelings for them, or whether they're "the one." Constant mental checking, comparing, seeking certainty. ROCD can occur in genuinely good relationships — the OCD attaches to the relationship as a theme, not because anything is actually wrong.

Sexual Orientation OCD (SO-OCD / HOCD)

SO-OCD involves intrusive doubts about your sexual orientation, regardless of what your actual orientation is. SO-OCD affects people of all orientations and is not a sign of repressed identity — it's OCD attaching to identity as a theme. The doubt itself, not the question of orientation, is the problem.

Religious / Scrupulosity OCD

Scrupulosity is OCD focused on intrusive thoughts about blasphemy, sin, moral failure or going to hell. Often accompanied by excessive prayer, confession or mental rituals. Common in people from religious backgrounds, but can occur in anyone, including the non-religious.

Contamination OCD

Contamination OCD is fear of germs, dirt, illness or contamination, accompanied by washing, cleaning, avoidance or decontamination rituals. Often confused with general hygiene; the difference is the time it consumes and the distress when it can't be completed.

Checking OCD

Checking OCD involves repeatedly checking locks, appliances, work, your own body, or your own memory. Driven by a fear of being responsible for something catastrophic that you might have missed. Checking is one of the most common compulsions in OCD.

Symmetry, Ordering & "Just Right" OCD

This subtype involves a need for things to feel right, balanced, or correctly arranged. Often accompanied by counting, repeating actions, or completing them until an internal "click" or "just right" feeling occurs. The fear isn't always articulated — sometimes the discomfort itself is the driver.

Health Anxiety OCD

Health OCD is distinct from general health anxiety — it's OCD that attaches to health themes specifically. Body-scanning, repeated checking for symptoms, Googling, seeking medical reassurance, often despite repeated clean test results. The compulsions, not the worry alone, distinguish it from general health anxiety.

How We Treat OCD: An ACT-Led Approach

Our primary approach to OCD is Acceptance and Commitment Therapy (ACT), an evidence-based treatment for OCD with a growing body of randomised controlled trial evidence behind it. ACT is part of the same therapy family as traditional CBT but addresses OCD differently — and for many clients, more effectively.

Why ACT for OCD?

Traditional OCD treatment focuses on either changing the thoughts or removing the anxiety. ACT does something different. It teaches you to change your relationship to the thoughts — to see them as mental events rather than commands — and to act on what actually matters to you, even while the thoughts are still there.

This matters for OCD specifically because:

OCD feeds on engagement. Every time you argue with, analyse, or try to neutralise an intrusive thought, OCD wins. ACT teaches you to step out of the argument entirely.

Certainty isn't the goal. A lot of OCD treatment implicitly promises that the thoughts will go away. They don't, fully — and chasing that goal keeps you trapped. ACT shifts the goal to living well alongside whatever the brain happens to produce.

It works without the threat of exposure flooding. Many people with OCD have tried more confrontational approaches and either dropped out or found them traumatising. ACT is gentler, paced, and values-led — but no less effective.

What ACT-Led OCD Therapy Looks Like

Treatment combines several evidence-based elements, tailored to you:

1. Cognitive defusion — learning to notice thoughts without engaging them. The first major shift most clients experience.

2. Acceptance work — building tolerance for the discomfort of intrusive thoughts and uncertainty, without needing to fix or remove them.

3. Values clarification — identifying what actually matters to you, separate from what OCD has been demanding of your attention.

Committed action — practical, between-session exercises that move you toward your values, even with the OCD still present.

Exposure-based work where useful — when working through specific compulsions or avoidance patterns, we incorporate exposure-based techniques in a paced, collaborative way. This is always agreed in advance and never done as flooding.

How long does it take?

Most clients see meaningful progress within 8–12 sessions, with the main treatment phase typically lasting 12–20 sessions. We review progress formally every 6 sessions. If you're not seeing change by session 10, we have an honest conversation about whether the approach needs adjusting.

"ACT for OCD is about giving you back what OCD has taken — your attention, your time, your sense of self — without requiring you to win an argument you can't win. The work is to step out of the fight, not to fight harder."

— Albie Mew-Davies, MBACP · Co-founder & Clinical Lead