Is there an official list of four types of OCD?

No. You may hear people use categories such as checking, taboo thoughts, symmetry, contamination, relationship OCD, or Pure O to describe their experience, but assessment is about obsessions, compulsions, time, impairment, and distress, not a fixed list.

Is contamination OCD distinct?

It is a familiar theme built on fears of dirt, illness, germs, chemicals, bodily fluids, or being contaminated inside. The underlying cycle of avoidance, checking, washing, and reassurance seeking is still recognisably OCD.

And Pure O: is it really just obsession?

Pure O is a popular term, but many people who use it still have compulsions. They may be mental in nature: praying, testing feelings, reviewing memories, neutralising, or trying to be sure of something.

Can an OCD quiz diagnose me?

No. A checklist can help you prepare for a conversation, but a proper diagnosis requires a qualified professional. If things are severe, disabling, or risky, step away from repeated searching and get professional help.

OCD Types, Themes and Common Questions

Q: Is OCD neurodivergent?

Some people use neurodivergent in a broad way, but OCD is usually described clinically as a mental health condition. It can overlap with autism, ADHD, tic disorders, anxiety, depression, or sensory differences, so careful assessment matters.

Q: What treatment is commonly used for OCD?

Public health and guideline sources commonly describe cognitive behavioural therapy with exposure and response prevention as an important psychological treatment for OCD. Medication may help some people and needs to be discussed with a qualified prescriber.

Quick orientation: OCD is not one size fits all; themes can look very different from person to person. The key thing to look for is how you respond to unwanted thoughts, images, doubts, urges, or sensations. Are they met with some form of compulsion, avoidance, checking, mental review, or a need for reassurance?

Please note that this page is for information only. It cannot put a label on OCD, autism, ADHD, anxiety, depression, or any other condition. If you are in immediate danger, considering severe self-harm or overdose, or simply do not feel safe, contact crisis support or local emergency services right now.

OCD types are themes, not separate boxes

You will see people talk about OCD types as though they were separate boxes, but they are really better understood as themes. People tend to search for them because their own particular version of contamination fears, harm fears, relationship doubts, religious doubts, sexual intrusions, health worries, checking, symmetry, or memories that will not settle can be hard to put into words.

These labels offer language, but they are not neat diagnostic compartments. A theme might shift with time. What is more stable is the pattern: a fear or doubt presents itself, you feel an urgent need for certainty, and a ritual or behaviour provides a measure of short-term relief. In doing so, it trains the cycle to return with greater force.

Contamination OCD, with fears of germs, chemicals, bodily fluids, dirt, or feeling polluted inside.
Checking OCD, where locks, appliances, messages, body sensations, or memories get reviewed again and again.
Harm OCD, where frightening thoughts about hurting someone run counter to the person's values.
Relationship OCD, with repeated questions about compatibility, attraction, love, morality, or whether the relationship feels right.
Pure O, where compulsions may be mainly internal, such as analysing, neutralising, confessing, or trying to get certainty.
False-memory or real-event OCD, where the past is rehashed intensely.
Symmetry or "just right" OCD, where exactness, balance, numbers, or a feeling of incompleteness drives the distress.

What about OCD and autism?

What of the link between OCD and autism? They can overlap and are sometimes conflated. Autistic needs for sameness, routine, sensory input, or focused interests are not in themselves compulsions. With OCD, the behaviour is typically motivated by guilt, disgust, threat, doubt, or the need to stave off something feared. One person can, of course, be both autistic and affected by OCD.

This is why the question "is OCD neurodivergent?" needs care. It is really a question of what kind of support is called for. A good assessment will take account of developmental history, sensory needs, anxiety, depression, distress level, and what happens when a routine or ritual cannot be finished.

Questions that often keep OCD going

If you find yourself asking do I have OCD?, do yourself a favour and pause to see whether the question is getting you anywhere or has turned into another loop for reassurance. Rereading the same answer or running through one quiz after another to prove an intrusive thought means nothing can feed the problem.

For specific themes, the site also has pages on relationship OCD, Pure O, false-memory and real-event OCD, and how to face intrusive thoughts.

Getting help in Ireland

When OCD starts to cause real distress, strain relationships, or narrow your options, it is worth speaking with a professional. The OCD therapy in Dublin and online page explains how counselling or psychotherapy may help. Public health sources point to CBT with exposure and response prevention as an important psychological treatment for OCD, while any medication decision needs to be discussed with a qualified prescriber.

You can also return to the OCD information hub or the broader psychotherapy and counselling in Dublin service page.

A few common questions

You will run into a few of the same questions from time to time. Is there an official roster of four OCD types? There is not one. People often put labels on things: checking, taboo thoughts, symmetry, relationship OCD, Pure O, or contamination. In an assessment, the focus is really on the obsessions and compulsions, how much time they take, and the distress and impairment they cause.

Take contamination OCD, for instance. It is a well-known pattern centred on germs, illness, or a sense of being unclean inside, yet the whole business of avoidance and seeking reassurance is recognisable as OCD. Then there is Pure O. The term has its fans, but in reality most people with it do have compulsions, even if they are mostly internal: praying, running through old memories, testing their own feelings, or trying to put their mind at ease.

As for whether OCD is neurodivergent, some people use that word in a loose sense. Clinically, OCD is usually described as a mental health condition, even if it can overlap with autism, ADHD, or tics. And do not expect an online quiz to hand you a diagnosis. A checklist may help you get your thoughts in order before you see someone, but diagnosis needs a qualified professional.

Sources and review

This material is for public information only. It does not stand in for assessment, diagnosis, crisis care, legal advice, medical advice, or individual psychotherapy. It was reviewed for source alignment on 15 May 2026.

For general website boundaries, see the website disclaimer.