Intrusive thoughts in children and teenagers

Have you noticed your child overthinking, distracted, or asking you the same question over and over for reassurance? Sometimes children and young people share a worry or an idea that seems to come from nowhere, and it can be unsettling to hear.

Parents often wonder what’s happening when a child blurts out a strange worry or seems stuck in their own head. Have you ever heard your child say something like:

• "What if something bad happens to you?"
• "What if I shout something awful in class?"
• "Did I leave the door open?"

If so, your child may be having intrusive thoughts. This guide explains what they are, why they happen, why they get louder in adolescence, when they’re worth taking seriously, and how the right support helps.

What are intrusive thoughts?

Intrusive thoughts are unwelcome ideas, images or urges that pop into the mind suddenly, often with no connection to what’s happening at the time. They can be odd, embarrassing, or frightening, and they can feel very out of character. That’s part of what makes them so distressing.

They’re also part of how a normal mind works. A large international study found that more than nine in ten people had at least one intrusive thought in the previous three months ^[1]. Almost everyone has them now and then, but far fewer have them often ^[2].

Having an intrusive thought doesn’t mean a child wants the thing to happen, nor that they believe it. It’s a thought, and like any other thought, it passes. Difficulties tend to start when the thought is treated as important, and that’s something a young person can be helped with.

Why having them doesn't mean anything is wrong

The thoughts that frighten children and parents most are usually the ones about harm, or about something taboo or shocking. Thoughts about harm are actually among the most common kinds of intrusive thought, even in young children, while taboo thoughts, such as sexual or religious ones, are the least common ^[1]. A caring, gentle child can have a violent or disturbing thought precisely because it’s so far from who they are.

Research suggests that what makes an upsetting intrusive thought keep coming back is not the thought itself. It’s the belief that the thought might be acted on, and the feeling that it can’t be controlled ^[3].

This is why reassurance can be so important. A thought about harm is not the same as a wish to harm, and it’s not, by itself, a sign that a child will act. When researchers looked closely at this in new mothers, unwanted thoughts of harming their baby were not linked with any greater risk of acting aggressively towards the baby ^[4]. The thought and the action are two completely different things. The UK charity OCD-UK makes the same reassuring point, that these thoughts are extremely common and having one says nothing about a person’s character ^[5].

Why intrusive thoughts get louder in the teenage years

Intrusive thoughts can happen at any age. In one study, most children aged 8 to 10 had experienced at least one, so they’re common well before a child reaches their teens ^[6]. But they often become far more noticeable in the teenage years.

Part of the reason may be the developing brain. Teenagers begin to think about their own thinking, and this deeper self-awareness means a young person notices their own thoughts more, including the strange or unsettling ones. In one study of people with OCD, children reported fewer intrusive thoughts than teenagers and adults, and found them less distressing and easier to control ^[7].

At the same time, adolescence brings a lot of change. Exams, shifting friendships, changes at home, and the pull towards independence can all make intrusive thoughts feel more intense. Researchers studying teenagers have found their intrusive thoughts work in much the same way as adults' do ^[8]. The combination of greater self-awareness and ordinary teenage pressure can leave a young person feeling as though their mind is busier than ever.

How intrusive thoughts can affect daily life

Intrusive thoughts sit on a spectrum. For many children and young people, they come and go without much fuss. A teenager might think, "What if I tripped on stage in the school play?", brush it off, and carry on. That’s a healthy example of noticing a thought without giving it weight.

For others, the thoughts start to interfere. They can cause:

• Trouble concentrating in class
• Difficulty falling asleep at night
• Avoiding situations that trigger the worry
• Asking parents or friends for reassurance over and over

Some young people experience spiralling, where one thought leads to another and grows in intensity. A child might think, "What if something bad happens to Mum?", which spirals into, "If I don’t check on her, it might be my fault", followed by repeated checking or reassurance-seeking. Spiralling can feel exhausting and frightening.

Sleep is one of the clearest places this shows up, and it works both ways. In teenagers, intrusive thoughts can be the link between worry and poor sleep ^[9]. And researchers think losing sleep can make intrusive thoughts harder to keep in check, which can become a tiring loop ^[10]. Protecting sleep is one practical way to ease the pressure.

Is it OCD, anxiety, ADHD or autism?

Most intrusive thoughts are a normal part of mental life and never need a label. Sometimes, though, parents want to understand where they fit, especially when the thoughts are frequent and distressing.

When intrusive thoughts become repetitive and start driving rituals or avoidance, they can be a feature of obsessive-compulsive disorder, or OCD. In OCD, the unwanted thoughts are the obsessions, and the checking, counting or reassurance-seeking are the compulsions ^[11]. Our guide to OCD in children and young people explains this in much more depth.

Intrusive thoughts also feature in anxiety and after frightening or traumatic events, and they can occur for autistic or ADHD young people too. They’re common in people with no mental health condition at all, so having them is not, on its own, a sign of one particular condition ^[12]. Our pages on anxiety and autism cover those areas. What matters is not slotting a child into a category, but noticing how much the thoughts distress them and get in the way.

Signs your child or teen may need more support

It’s normal for children and young people to have the occasional unwanted thought. It’s worth paying closer attention when the thoughts become frequent or distressing, and start to affect everyday life. You might notice signs such as these.

In younger children

• Repeated worries about safety or harm
• Asking the same reassurance-seeking questions over and over
• Becoming tearful or clingy at home or school
• Trouble concentrating on play or learning

In teenagers

• Withdrawing from friends or activities they used to enjoy
• Seeming restless, distracted, or preoccupied
• Changes in appetite or sleep
• Talking about worries they can’t stop thinking about

In older teenagers and young adults

• Feeling unable to switch off their mind
• Avoiding responsibilities or social plans because of worry
• Expressing guilt, shame, or distress about their thoughts
• Noticing the thoughts get in the way of study, work, or relationships

If these signs sound familiar, it can help to seek support. The YoungMinds parent helpline is a free, confidential first stop if you’re not sure whether what your child is experiencing needs professional input. Your GP is also a good place to start.

Intrusive thoughts are unwanted and unwelcome, which is different from a young person having thoughts of ending their life or harming themselves on purpose. If your child is talking about wanting to die or to hurt themselves, help is available.

If you believe your child is in immediate danger, call 999 or go to A&E. If you’re worried about their safety, contact your GP and ask for an urgent appointment, or call NHS 111 and choose the mental health option. You don’t have to be sure how serious it is before asking for help. If you’re unsure, call NHS 111. Your child can also talk to Childline on 0800 1111, call Samaritans on 116 123, or text SHOUT to 85258. Finding Therapy is not a crisis or emergency service.

How counselling helps with intrusive thoughts

Counselling gives a child or young person a safe, non-judgemental space to talk about the thoughts they’re having, often for the first time. Many young people feel a wave of relief simply from saying the thoughts out loud and learning that they’re common.

The aim is not to get rid of intrusive thoughts, since everyone has them. It’s to change a young person’s relationship with them, so the thoughts lose their grip. A counsellor can help a young person understand what intrusive thoughts are, notice when they arrive, and respond differently, without the suppression and reassurance-seeking that keep them going.

At Finding Therapy our work is integrative and person-centred. Our counsellors build a trusting relationship with the young person and draw on whichever approaches suit them as an individual, rather than applying a single fixed method. This fits the wider evidence. In a review of 28 trials with young people, therapies aimed specifically at repetitive negative thinking did no better overall than more general ones. Approaches that change how a young person relates to their thinking, rather than what they think, seemed to ease that repetitive thinking the most ^[13].

This is also why the relationship between a young person and their counsellor matters so much. Across a large body of research, a trusting relationship is consistently associated with better outcomes, whatever the type of therapy ^[14]. It’s worth finding a counsellor your child feels comfortable with.

Counselling can also be a good fit online, which suits many young people who find it easier to open up from their own room. For anxiety and depression in children and young people, research suggests therapy delivered through a screen can work about as well as meeting in person ^[15]. That research was not about intrusive thoughts specifically, so treat it as general reassurance about online therapy for young people rather than proof. Our piece on whether online therapy really works covers the wider evidence.

How parents can help at home

Alongside counselling, there’s a lot you can do at home to support a child or teenager with intrusive thoughts.

• Remind them that everyone has intrusive thoughts. There’s nothing wrong with them, and a thought is not a fact. Knowing the thoughts are common can take away much of their power.
• Keep communication open. Let your child know they can share what is on their mind, and listen calmly without judgement or rushing to fix it. Often, simply being heard eases the distress.
• Go gently with reassurance. Answering the same worried question again and again can feel comforting in the moment, but it can quietly feed the cycle, especially if the thoughts are starting to look OCD-shaped. Try acknowledging the feeling rather than answering the question on a loop.
• Try calming and grounding activities. Slow breathing, mindfulness, or a grounding exercise can help a young person come back to the present. One version is to name five things they can see, four they can touch, three they can hear, two they can smell, and one they can taste.
• Protect sleep. A steady bedtime and a wind-down routine can leave less room for worry at night, and better sleep can make the thoughts easier to manage.

Finding the right support

Intrusive thoughts can be hard for a child or teenager to face alone. Getting support early can help a young person feel calmer, steadier and more in control again.

At Finding Therapy, you can browse our counsellors and choose someone for your child yourself. We’ve vetted every one of them, and we’ve known them for years. If you’d like help choosing, you can book a free consultation with Helen Spiers, our Head of Counselling, who can help with a recommendation. We’re a private, paid service, so there’s no GP referral needed, and we work online with children and young people aged 6 to 25.