OCD Subtypes
OCD Comes in
Many Forms.
One Treatment.
By Justin La Rose, RP, M.Psy · Registered Psychotherapist (CRPO) · Clinical Director, The OCD Clinic
Evidence last reviewed: October 2026
The main types of OCD are harm OCD, contamination OCD, checking OCD, relationship OCD (ROCD), POCD, scrupulosity, sexual orientation OCD, health anxiety OCD, existential OCD and Pure O. They're themes of one disorder. OCD is like a bully that goes after whatever you care about most. The content changes. The loop underneath doesn't, and neither does the treatment.
Every type runs the same cycle: an intrusive thought, a spike of anxiety, a compulsion, a moment of relief, and a stronger obsession next time. Do what the bully says and it gets louder. Every type responds to the same treatment: Exposure and Response Prevention (ERP).
So which type you have matters less than you'd think. What matters is whether the therapist you see understands OCD well enough to treat it, whatever the content.
The short answer
- First-line treatment: Exposure and Response Prevention (ERP), a form of CBT, is a first-line treatment for OCD in the American Psychiatric Association's practice guideline (Koran et al., 2007).
- Strength of the evidence: Across 37 randomized trials, CBT that includes ERP produced large effects for OCD compared with waitlist and placebo conditions (Öst et al., 2015).
- Taboo themes get missed: When mental health professionals read case descriptions of OCD, 38.9% were identified as something other than OCD, rising to 77.0% for sexual orientation obsessions, 42.9% for sexual obsessions about children and 31.5% for aggressive obsessions (Glazier et al., 2013).
- Mental compulsions: In a field trial of people with OCD, most had both mental and behavioural compulsions (Foa et al., 1995), which is why Pure O is rarely pure.
What are the main types of OCD?
The main types of OCD are the ten themes below, and they're the ones I see most. If yours doesn't map neatly onto one, that's super common. In my room, OCD often blends themes, or moves from one to another over the years.
Harm OCD
COMMONIntrusive thoughts about harming someone you love, a stranger, or yourself. Ego-dystonic is the clinical word: the thoughts feel at odds with who you are. The fear sticks to the thought itself, and to what having it might say about you.
COMMON COMPULSIONS
- Mental reviewing of incidents
- Avoiding sharp objects or 'dangerous' situations
- Seeking reassurance from others
- Checking for evidence that you acted on the thought
Contamination OCD
COMMONFear of germs, illness or chemicals, or of feeling contaminated by something that isn't physical at all, like a sense of wrongness or moral dirt. The washing, avoiding and asking buy a few minutes of relief, and teach your brain the danger was real.
COMMON COMPULSIONS
- Repeated handwashing or showering
- Avoiding public spaces or objects
- Requiring others to follow decontamination rituals
- Mental checking for whether contamination 'spread'
ROCD (Relationship OCD)
OFTEN MISDIAGNOSEDDoubt about your relationship that won't let go. Do I love my partner enough? Are they the right person? Am I attracted to them? Did I damage something? Reassurance buys an hour, then the question comes back with a new angle.
COMMON COMPULSIONS
- Constantly seeking reassurance from partner
- Mentally reviewing feelings to 'check' if they're real
- Comparing your relationship to others
- Confessing perceived relationship transgressions
POCD
HIGHLY DISTRESSINGUnwanted intrusive thoughts or images of a sexual nature involving children. People with POCD usually spend hours trying to prove what the thoughts mean about them, and the proving is what keeps the loop running. POCD is heavily stigmatized, which often delays people from seeking help.
COMMON COMPULSIONS
- Avoidance of children, childcare settings, or media
- Checking groins for arousal as 'proof'
- Mental reviewing of past interactions
- Seeking reassurance about being a good person
Scrupulosity OCD
RELIGIOUS / MORALFear of sinning, of being morally rotten, or of offending God or your own ethics. It can be religious (fear of blasphemy, prayers that have to be done exactly right) or secular (guilt over small wrongs that never closes, moral perfectionism). It goes after what you care about most.
COMMON COMPULSIONS
- Excessive prayer or confession
- Seeking reassurance from religious figures
- Mental reviewing of moral decisions
- Avoidance of anything that feels morally ambiguous
Checking OCD
COMMONChecking driven by doubt. Did I lock the door, turn off the stove, hit someone with the car, say something hurtful? Each check buys a moment of relief and makes the next doubt louder. After a while the checking is the problem, more than the stove ever was.
COMMON COMPULSIONS
- Repeated checking of locks, appliances, doors
- Retracing routes to look for evidence of accidents
- Rereading sent messages multiple times
- Asking others to confirm everything is fine
Health Anxiety OCD
OVERLAPS WITH SOMATIC OCDFear of having a serious illness, usually set off by a body sensation or a symptom you think you noticed. What marks the OCD version is the checking and reassurance-seeking, and how fast a clear test result or a doctor's word stops working before the doubt returns.
COMMON COMPULSIONS
- Repeated body checking and symptom scanning
- Googling symptoms obsessively
- Multiple doctor visits for the same concern
- Seeking reassurance from family about symptoms
Pure O
MISUNDERSTOODPure O is shorthand for OCD where the compulsions are mostly mental. The obsessions are all there (intrusive thoughts, images, urges), but the rituals happen in your head: reviewing, reassuring yourself, counting, pushing thoughts away. It isn't really pure. It just looks that way from the outside.
COMMON COMPULSIONS
- Mental reviewing and analysis
- Thought suppression and substitution
- Internal reassurance-seeking
- Mental counting or neutralizing
Sexual Orientation OCD (SO-OCD)
OFTEN MISREADIntrusive doubt about your sexual orientation, sometimes called HOCD. It can affect people of any orientation. The engine is the demand to be 100% certain about who you are, and every body check, test and memory review feeds it. Treatment leaves the question of who you are to you.
COMMON COMPULSIONS
- Checking your body for a 'groinal response'
- Mentally reviewing past attractions for 'evidence'
- Seeking reassurance about what you 'really' are
- Avoiding people, media, or situations that trigger the doubt
Existential OCD
HIGHLY RUMINATIVELooping, distressing rumination about questions nobody can answer: the meaning of life, whether reality is real, consciousness, death, infinity. It's like the detective who can't close the case: every argument turns up a new lead, and the more you think, the stickier it gets.
COMMON COMPULSIONS
- Ruminating for hours to 'solve' the question
- Googling philosophy or physics for a definitive answer
- Seeking reassurance that reality is real or life has meaning
- Avoiding triggers about space, death, or time
Does the type of OCD change the treatment?
No. The theme of your OCD doesn't change the treatment. Harm, ROCD, contamination, POCD: the mechanism is the same. You face the trigger, drop the ritual, and learn that the feared outcome doesn't arrive, or that you can carry the doubt without solving it. What matters is a therapist who can build an exposure hierarchy for your specific triggers and stay with you through the hard parts. Whether that therapist has lived with OCD themselves matters less than their training in ERP, which is the question behind does my therapist need to share my experience?
If you've been told your theme is too unusual to treat, or too disturbing for exposures, get a second opinion from an ERP-trained therapist. Disturbing content is exactly what ERP was built for.
Related Resources
FAQ
What Else Do People Ask About OCD Subtypes?
I can't answer that from a web page, and anyone who says they can is guessing. What I can tell you is the pattern: OCD tends to latch onto the things you care about most, like your morality, your relationships and your safety. Having a thought isn't the same as intending to act. A clinician assesses risk from the whole picture, not from one symptom, and looking at the whole picture is exactly what the free consultation is for.
In my practice, people with moderate OCD usually finish the active part of ERP in about 12 to 16 weekly sessions; it can be shorter or longer. You'll get an honest estimate after your assessment, not a promise. The first 4 to 6 weeks usually feel like the hardest, because you're facing things you've been avoiding without the compulsions that used to bring relief. You won't be doing it alone: your therapist plans each step with you and adjusts the pace as you go. After those first 4 to 6 weeks, many people I work with start to notice the OCD has less pull.
Talk therapy helps you understand your feelings. ERP changes what you do when they show up. You face the thoughts and situations that trigger your OCD without doing the compulsion, and you learn that what you feared doesn't happen, or that you can carry the uncertainty without the ritual. If insight alone fixed OCD, I wouldn't need a clinic just for OCD. Many people arrive here after years of therapy that never targeted the cycle. ERP is recommended as a first-line treatment for OCD by NICE and the American Psychiatric Association (NICE, 2005; Koran et al., 2007).
Individual OCD sessions are $250 (50 min) with a senior clinician or $225 with an associate clinician, and the first 20-minute consultation is free. Limited sliding scale options are available, ask about them. Many extended health benefits plans cover psychotherapy from a Registered Psychotherapist, with limits that vary by plan, so check with your provider to confirm your coverage.
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Book Free ConsultationHow we researched this page
This page draws on the American Psychiatric Association's practice guideline for OCD (Koran et al., 2007), a meta-analysis of 37 randomized trials of CBT and ERP (Öst et al., 2015), a survey of how well mental health professionals recognise OCD (Glazier et al., 2013) and the DSM-IV field trial on mental and behavioural compulsions (Foa et al., 1995), alongside the themes I see in my own practice. The treatment trials mostly mix subtypes and rarely report results theme by theme, so the point that every theme gets the same treatment rests on those mixed trials plus clinical experience. The misidentification figures come from US psychologists reading written case descriptions, not from real clinic visits.
A note on my perspective
I run a private clinic that treats OCD with ERP, and I'm paid when people book with us. Read what I write with that in mind. Public and lower-cost routes exist too, and the Ontario OCD treatment guide lays them out next to ours.
About the author
Justin La Rose, RP, M.Psy is a Registered Psychotherapist with the College of Registered Psychotherapists of Ontario (CRPO) and Clinical Director of The OCD Clinic in Toronto. He has worked in mental health for more than 25 years and treats OCD with Exposure and Response Prevention (ERP). You can confirm his registration on the CRPO public register.
Client stories on this site are composites, with names and identifying details changed. How we write client stories
How to cite this page
La Rose, J. (2026). OCD Subtypes: OCD Comes in Many Forms. One Treatment.. The OCD Clinic. https://theocdclinic.ca/ocd-subtypes