Perinatal OCD: what it is and why moms rarely talk about it

The thought that wouldn't leave was about the bath.

Not a wish. Not a plan. An image, unbidden and horrifying, that kept arriving while she bathed her baby and then stayed with her long after the water had drained. She started avoiding the bath entirely. Then the sink. Then any room where her baby was near water. She told her health visitor she was fine.

She wasn't fine. But she was also not what she feared she was. She had perinatal OCD. And she didn't know that existed until a therapist named it, more than a year later.

This is not a rare story. It is a common one that almost nobody tells out loud.

What perinatal OCD actually is

Obsessive-compulsive disorder in the perinatal period, meaning during pregnancy or in the year following birth, is a clinical anxiety disorder characterised by two core features: obsessions and compulsions.

Obsessions are unwanted, intrusive thoughts, images or impulses that cause significant distress. In the perinatal context, these typically involve harm coming to the baby, often at the mother's hands, though they may also involve contamination, accidents or catastrophic events. They are ego-dystonic, meaning they feel deeply at odds with who the person is and what they want. The mother having these thoughts is not a threat to her child. She is someone who loves her child so much that the possibility of harm is unbearable.

Compulsions are the behaviours that develop in response to the obsessions: checking, avoiding, seeking reassurance, performing mental rituals. They provide temporary relief but maintain and strengthen the obsessive cycle over time. The more a person avoids the bath, the more frightening the bath becomes.

The International OCD Foundation estimates that perinatal OCD affects between one and three percent of pregnant and postpartum women. Some studies suggest the figure is higher, with underreporting driven by shame and the specific fear of what disclosure might mean for child custody. A 2014 study published in the Archives of Women's Mental Health found that fear of being judged an unfit mother was the most commonly cited reason women with perinatal OCD did not seek help.

Why it goes unrecognised for so long

Perinatal OCD is consistently underdiagnosed for several interconnected reasons.

The first is that it looks, from the outside, like extreme caution or good parenting. A mother who checks obsessively, avoids certain situations and seeks constant reassurance that her baby is safe is not obviously unwell. She appears devoted.

The second is that the content of the intrusive thoughts is so distressing that most women cannot bring themselves to describe it. Telling a health professional that you have recurrent, vivid images of harming your baby requires an extraordinary level of trust and a working understanding that having the thought is not the same as intending the act. Most mothers have neither, because nobody has told them.

The third is that perinatal OCD is often confused with postpartum depression or postpartum anxiety, both of which present with some overlapping features. The distinction matters because while there is significant overlap in treatment approaches, OCD-specific therapy, particularly exposure and response prevention (ERP), is the most effective treatment for OCD and is different from what is typically offered for depression or generalised anxiety.

The difference between intrusive thoughts and perinatal OCD

Not all intrusive thoughts indicate OCD. The distinction is partly about frequency and intensity but more specifically about what happens in response to the thoughts.

Intrusive thoughts (very common)Perinatal OCD

Thoughts are distressing but intermittent

Thoughts are frequent, persistent and consume significant mental energy

Person can move through the day despite the thoughts

Thoughts significantly disrupt functioning and daily activities

No significant compulsive response develops

Compulsions develop and grow over time to manage the distress

Thoughts reduce naturally with time

Without treatment, the cycle maintains or worsens

Person may mention it if asked

Person actively conceals it due to shame or fear

If the intrusive thoughts are accompanied by rituals, avoidance or reassurance-seeking that is taking up significant time or energy, that is the pattern worth taking to a professional.

What treatment looks like and why it works

The evidence base for perinatal OCD treatment is specific and encouraging.

Cognitive behavioural therapy with a focus on exposure and response prevention is the most effective psychological treatment for OCD, including the perinatal form. ERP involves gradually facing the situations or thoughts that trigger obsessions while refraining from performing the compulsive response. This is uncomfortable. It is also, with proper therapeutic support, highly effective.

A 2018 Cochrane review of psychological treatments for perinatal mental health found that CBT-based approaches produced significant improvements in OCD symptoms with effects that were maintained at follow-up. Medication, specifically selective serotonin reuptake inhibitors (SSRIs), is also effective for OCD and several SSRIs are considered safe during pregnancy and breastfeeding. A GP or psychiatrist can advise on specific options.

The crucial first step is naming it to someone. A GP, a midwife, a health visitor. Saying the words "I am having intrusive thoughts about my baby and I am also doing things to manage them" is enough of a starting point for a professional to begin the assessment process.

What to do if this sounds familiar

• Talk to your GP or midwife. You do not need to describe every thought in detail. You can say that you are having distressing, repeated thoughts about harm and that you are avoiding things or checking because of them.
• Ask specifically about perinatal OCD. It is worth naming it, because not all practitioners will think of it without a prompt.
• Find a therapist trained in ERP. The British OCD and Body Dysmorphic Disorder Foundation (OCD-UK) has a therapist directory. In the US, the IOCDF directory lists practitioners with OCD expertise.
• Know that having the thought is not the same as being dangerous. This is the thing that matters most and is hardest to hold onto without support. It is also the thing most people with perinatal OCD need to hear repeatedly before it starts to land.

"You are not your thoughts. You are the one who notices them." - Russ Harris, The happiness trap

If what you're experiencing is intrusive thoughts without the compulsive pattern described here, Intrusive thoughts in motherhood: you're not a bad mom addresses that experience specifically. And if postpartum anxiety is part of what you're navigating alongside OCD, Postpartum anxiety: how to recognise it and cope offers a companion resource.

You are not a danger to your child. You are someone who needs support. Those are very different things.

If you are in crisis or having thoughts you feel at risk of acting on, contact your GP or midwife immediately. In the UK: Samaritans on 116 123. In the US: 988 Suicide and Crisis Lifeline.

Further reading: Lee Brosan & Gillian Todd, Overcoming obsessive compulsive disorder (2009). Postpartum Support International: postpartum.net. OCD-UK: ocduk.org.