It's not just a phase: how to recognise OCD in children early

Obsessive-Compulsive Disorder (OCD) is more than just a quirky habit or a “phase” children grow out of. It’s a mental health condition that can cause real distress, not just for a child, but for the whole family.

OCD has two closely connected parts: obsessions and compulsions. Obsessions are intrusive, unwanted thoughts, images, or worries that seem to get stuck in a child’s mind. These thoughts can feel overwhelming and confusing, often bringing anxiety or fear. A child might worry that something bad will happen, question whether they’ve done something wrong, or feel responsible for things outside their control.

Compulsions are the behaviours a child uses to try to ease that anxiety. These might be visible actions, such as checking, washing, or repeating routines, or they can happen mentally, like silently repeating words or constantly seeking reassurance. I often describe OCD to families as a "hungry monster": the more you feed it with compulsions, the bigger and louder it becomes. By doing the compulsions, it reinforces the neural pathway in our brain that tells us we need to do this action to feel safe. By "starving the monster", or not feeding the compulsions, we activate a new neural pathway which says "you are safe, you don’t need to do these behaviours".

While many children experience worries or habits from time to time, OCD is different. It becomes persistent, distressing, and begins to interfere with everyday life.

What causes OCD in children?

There isn’t one single cause of OCD. Instead, it usually develops from a combination of factors. Some children are naturally more anxious, cautious, or perfectionistic, which can make them more vulnerable. Stressful life events, such as illness, school pressures, family changes, or loss, can also trigger symptoms.

For some children, OCD behaviours develop as a way of coping with anxiety. If a child has experienced trauma, bullying, or ongoing stress, they may begin to rely on rituals or repetitive thoughts to feel safe. Children can also pick up anxious patterns from those around them.

There are also biological factors to consider. Research suggests differences in how the brain processes anxiety may play a role, including the involvement of brain chemicals like serotonin, although it’s still unclear whether this is a cause or effect. Genetics may increase vulnerability, too, although no single cause has been identified. In rare cases, a condition called PANDAS can lead to a sudden onset of OCD symptoms following a streptococcal infection.

What are the early signs of OCD in children?

OCD often appears as a pattern of anxious, intrusive thoughts followed by behaviours aimed at reducing that anxiety. You might notice your child excessively washing or avoiding it, repeating rituals, harming themselves, checking things, counting over and over, hoarding items or developing a strong need for things to feel “just right”. Everyday tasks like getting dressed or completing homework can begin to take a long time, and your child may start avoiding certain objects, places, or situations that trigger worry.

One of the most common and often overlooked signs is reassurance seeking. Parents can find themselves drawn into the cycle without even realising it. A child may repeatedly ask questions like, “Are you sure I didn’t do something bad?” or need you to respond in a very specific way. You might say, “I love you too,” but your child becomes distressed because it doesn’t sound exactly the same as it did yesterday. OCD often demands a response that feels “just right”, but the relief this brings is only temporary. A key feature of OCD is that the child feels driven to do these things, even when they don’t want to.

Habits or OCD: how can you tell the difference?

Many children enjoy routines and develop little habits, and this is a completely normal part of growing up. However, with OCD, the difference lies in the level of intensity, distress, and control.

Typical habits, such as bedtime routines, collecting favourite items, or wearing “lucky” clothes, are usually flexible. Children can stop if needed and won’t become overly distressed if these routines are interrupted. These behaviours also tend to fade naturally over time.

OCD behaviours feel very different. A child may feel compelled, or even forced, to carry them out. They might want to stop but feel unable to do so, and the distress can be significant. These behaviours can begin to interfere with school, sleep, and friendships, and may take up a large portion of the day.

If you’re unsure, gently interrupting the behaviour can give you useful insight. A child with a habit will usually move on fairly easily, whereas a child with OCD is more likely to become anxious or distressed. Asking what they think might happen if they didn’t complete the behaviour can also help, as OCD is often driven by a strong “what if?” fear.

Understanding overlap with ADHD and autism

It’s also important to recognise that OCD can sometimes look similar to ADHD or autism.

Although behaviours may appear similar on the surface, the reasons behind them are quite different. OCD is driven by anxiety and intrusive thoughts, which push a child to repeat behaviours in order to prevent something bad from happening. In contrast, autism-related behaviours are usually linked to comfort, predictability, or sensory regulation, and are often calming or enjoyable rather than distressing. ADHD behaviours tend to come from impulsivity, restlessness, or difficulty maintaining attention, rather than fear or a need for routine.

Understanding what is driving the behaviour is often the key to making sense of what you’re seeing.

What behaviours should parents not ignore?

There are certain signs that suggest it may be time to seek professional support. These include rituals that begin to take up large parts of the day, or a child becoming extremely distressed if routines are not followed exactly. You may notice your child starting to avoid school, friendships, or everyday activities, or see physical effects such as sore or cracked skin from excessive washing, hair pulling or skin picking.

Repeated reassurance seeking that never seems to ease anxiety is another common sign, as are intrusive thoughts about harm, death, or something bad happening. A sudden and dramatic onset of symptoms, particularly following an illness, should also be taken seriously.

When should I seek help?

If OCD behaviours are beginning to disrupt everyday life or place a strain on your family, it’s important to seek support. Many parents naturally try to ease their child’s distress by accommodating behaviours, whether that’s answering repeated questions, avoiding triggers, or helping complete rituals. While this is completely understandable, it can unintentionally reinforce OCD over time. Support is not just about helping your child, it’s about helping the whole family.

What to do if you’re concerned

Start by speaking with your GP, paediatrician, or a qualified mental health professional. The reassuring news is that OCD is highly treatable, and early support can make a real difference.

It’s important to look for professionals who have experience treating OCD using evidence-based approaches such as Cognitive Behavioural Therapy (CBT) and Exposure and Response Prevention (ERP), as these are the most effective treatments for breaking the OCD cycle.

Keeping track of patterns can also be helpful, including what triggers behaviours, how long they last, and how your child responds. At home, try to approach your child with calm curiosity and understanding. For example, you might say, “I can see this is really worrying you. It looks like things don’t feel quite right at the moment. You’re safe, and I’m here to help you through it.” This kind of response offers comfort without reinforcing the OCD cycle.

Recognising OCD early can feel overwhelming, but it’s also a powerful first step. With the right support, children can learn to manage their thoughts, reduce their anxiety, and return to simply enjoying being children. We should all have access to living a values-driven life, driven by fun, adventure, kindness and more, not one driven by fear.