Harm OCD and “Pure O”: when intrusive thoughts feel unbearable

Harm OCD is an informal name for obsessive-compulsive disorder (OCD) in which the unwanted thoughts are about hurting yourself or someone else, on purpose or by accident. The thoughts feel horrifying precisely because they clash with who you are, and OCD charities are clear that they are not a sign you want to act on them or will. “Pure O” is a popular term, not a medical diagnosis, for OCD where the compulsions are mostly hidden in the mind. Both are treatable, and talking about them with a professional is a safe thing to do.

Key points

• The NHS lists fears of deliberately or accidentally harming others among common OCD obsessions.
• OCD Action says there is no evidence that intrusive thoughts in OCD show risk or predict action.
• “Pure O” is not a medically recognised term. OCD-UK avoids it because it can hide the compulsions people are doing.
• Compulsions can be mental, such as repeating words in your head or trying to cancel a thought with a “good” one.
• NICE recommends CBT that includes exposure and response prevention (ERP), and in some cases medication through your GP.

What is harm OCD?

OCD has two parts. Obsessions are unwanted thoughts, images or urges that keep coming back and cause intense anxiety or distress. Compulsions are things you do, outwardly or in your head, to try to ease that distress or prevent what you fear. Harm OCD is not a separate diagnosis. It is a way of describing OCD when the obsessions centre on harm.

The NHS gives examples such as fearing you might attack your children, or fearing you might cause a fire by leaving the cooker on. Other examples might include:

• A sudden image of pushing someone in front of a train.
• A fear of grabbing a knife while cooking with family nearby.
• Worrying that you might lose control and hurt a partner, a parent or a pet.
• Doubting whether you hit someone while driving, even though nothing happened.
• Fears of harming yourself that feel unwanted and frightening rather than wished for.

If you recognise yourself here, you are not alone. NICE notes that aggressive, sexual and death-related intrusive thoughts are common in people with OCD, and that they are often mistaken for a sign of risk.

Does having violent thoughts mean I am dangerous?

This is usually the question underneath everything else. The NHS describes intrusive violent thoughts as only thoughts, and says they do not mean you will act on them. OCD Action explains that the distress comes from how strongly the thoughts go against your values and sense of self. The horror you feel is itself part of the picture.

In OCD, the trouble is not the thought but the meaning you attach to it: “What if this means I am secretly violent?” That question creates anxiety, and anxiety makes the mind watch out for the thought, so it returns more often. This is why trying to prove to yourself that you are safe rarely brings lasting peace.

If you have had thoughts of harming yourself that feel like wishes or plans, rather than unwanted fears, please speak to your GP or one of the crisis services listed below. Only a qualified professional can help you make sense of what you are experiencing.

What does “Pure O” mean?

“Pure O” is short for “purely obsessional”. It is used online to describe OCD where there seem to be no visible compulsions, only distressing thoughts. It is not a formal diagnosis, and you will not find it in NHS or NICE guidance.

OCD-UK says the term can be unhelpful, because people who believe they have “only obsessions” may not notice the compulsions they are doing, and those compulsions are what keep OCD going. It also points out that most people with this kind of OCD do have some outward behaviours too, such as checking their phone for reassurance or avoiding certain people or places. The term is still useful in one way: it helps many people realise that OCD is not just about handwashing or tidiness.

What do hidden compulsions look like?

The NHS notes that not all compulsions are obvious to others. Mental and quieter compulsions in harm OCD can include:

• Mental reviewing, going back over a memory to make sure you did not do anything harmful.
• Neutralising, trying to cancel a bad thought with a good thought, word or prayer.
• Checking your feelings, testing whether you felt an urge or whether the thought “meant something”.
• Reassurance-seeking, asking others or searching online whether people like you ever act on these thoughts.
• Avoidance, keeping away from knives, children, bridges or being alone with someone you love.

Each of these brings a little relief, but the doubt soon returns and the cycle starts again. Reading articles like this one can become part of that cycle too, so it may help to notice whether you are reading for understanding or for certainty.

Can harm OCD start after having a baby?

Yes. The NHS says OCD can begin during pregnancy or after birth, and obsessions can include fears of harming the baby. The Royal College of Psychiatrists estimates that perinatal OCD affects 2 to 3 in every 100 women after having a baby. If this is happening to you, your GP or health visitor can help. These are recognised experiences, and professionals understand the difference between unwanted fears and a real risk.

What helps with harm OCD?

NICE recommends cognitive behavioural therapy (CBT) that includes exposure and response prevention (ERP) for OCD. In ERP, a trained therapist helps you gradually face the thoughts and situations you fear while resisting the compulsions, so the anxiety can settle on its own. NICE also recommends a type of antidepressant called an SSRI for some adults, so if you are wondering about medication, talk to your GP. You can read more in our guide to which therapy helps with OCD.

Some general ideas many people find helpful alongside treatment:

• Label the thought: “This is OCD, not a warning.”
• Let the thought be there instead of arguing with it or pushing it away.
• Notice an urge to check, review or seek reassurance, and see if you can delay it a little.
• Gently return to things you have been avoiding, at a pace that feels possible.
• Use a short grounding exercise when anxiety spikes, as a way to settle, not to make the thought go away.

Where can I get help in the UK?

In England you can refer yourself to NHS Talking Therapies without seeing your GP first. Your GP can also talk through your symptoms, medication and referral options. Charities such as OCD-UK and OCD Action offer information and peer support. NICE advises health professionals who are unsure about the risk linked to these thoughts to consult someone with specific expertise in OCD, which reflects how well recognised they are.

Many people put off asking for help because they fear being judged or reported. Mental health professionals hear intrusive thoughts of every kind, and saying them out loud is often the first step in loosening their grip. Our guide to intrusive thoughts covers the wider picture.

How therapy can help

As an integrative psychotherapist registered with the BACP, I offer a calm, non-judgemental space where you can say what is in your mind without fear of how it will be received. Drawing on person-centred, psychodynamic and CBT-informed ideas, we can look at the cycle that keeps the thoughts stuck, the shame that often surrounds them and what may be feeding the anxiety underneath. You can read more about how I work with OCD and anxiety. Sessions are available in Farringdon, Central London, or online, in English or Turkish.

If you are in crisis, call 999, go to A&E, call NHS 111, or contact Samaritans on 116 123 (free, 24/7).

If harm thoughts are wearing you down, you are welcome to get in touch to arrange an initial consultation. You do not have to explain everything at once, and we can go at a pace that feels manageable.