Intrusive thoughts: What they are and how to manage them

Have you ever had a sudden, unwanted thought that felt shocking or upsetting? They differ from everyday thoughts because they tend to stick, repeating themselves and creating intense anxiety. They often have a sharp edge – violent, destructive, persecutory, or paranoid – and can leave us questioning our motives and beliefs.

As a result, we begin to doubt ourselves. What kind of person thinks this? Am I dangerous? Does this mean something about who I really am? This creates more anxiety, and it becomes a self-feeding loop.

The first thing to say is this: you are normal. Everybody has intrusive thoughts to some degree. You are not alone. They are just thoughts, and recognising them as thoughts can be reassuring in itself. Believing these thoughts and treating them as facts can intensify anxiety, but intrusive thoughts are not the same as acting on them.

Different ways to think about intrusive thoughts

A psychoanalytic perspective

According to Freud, we are all born with what he termed the id – the part of the psyche driven by instinctual impulses. In early childhood, these impulses are experienced intensely and expressed directly: the urge to run across a road without hesitation, to throw something at another child, or to act without consideration of consequences.

As development progresses, the ego and superego begin to emerge. These aspects of the psyche regulate impulses and shape our sense of self, including our values, beliefs, and moral framework. Through their development, impulsive urges are increasingly managed rather than acted upon.

When thoughts or impulses arise that conflict with this developed sense of self, they are experienced as intrusive. Such thoughts, because they are inconsistent with a person’s self-image, are referred to as ego-dystonic.

If you were to enter a young child’s mind, you might find a wide mix of intense emotions and impulses – from anger and fear to affection and curiosity – all coexisting at once. Over time, the developing ego and superego help organise and contain these experiences, allowing us to “think.” Through this process, we learn to use our cognitive mind to make sense of our inner and outer worlds via perception, sensation, and intuition.

A modern psychological perspective

In modern psychology, intrusive thoughts can be understood as a kind of misfiring within the cognitive system. It is as though the mind fails to accurately perceive the present moment and instead produces what some describe as “brain hiccups.”

Importantly, contemporary perspectives have shifted away from viewing intrusive thoughts as inherently pathological. Instead, they are now seen as a common part of the human experience. What determines whether they become a clinical issue is not the thought itself, but how a person relates to it and responds. Thinking something is very different from acting on it.

What are common causes of intrusive thoughts?

Intrusive thoughts can have many causes, and their intensity and frequency vary from person to person. Below are some possible contributing factors.

Anxiety

Anxiety can be a contributing factor that intensifies intrusive thoughts. These thoughts can increase during transitional periods in life, such as a breakup, starting a new job, or experiencing bereavement, all of which can heighten feelings of anxiety.

Anxiety can distort our perception of reality, creating an environment in which intrusive thoughts are more likely to take hold. When the mind is anxious, it becomes harder to distinguish between what is happening internally and externally. Anxiety thrives on a cycle: feeling anxious invites intrusive thoughts, those thoughts increase anxiety, and thoughts and emotions continue to feed into one another. 

Stress

Stress can be subtle and cumulative. We may not realise we are under stress until symptoms such as intrusive thoughts begin to appear. Prolonged stress at work, at home, or both can mean that we do not notice signs that we need to look after ourselves more.

When we are stressed, we tend not to eat or sleep well, and we may overwhelm our diaries, which in turn overwhelms our minds and bodies. This could mean that our nervous systems are running on empty. Reducing stress, taking time to rest, and practising some self-care can help here.

Trauma

Perhaps you have witnessed an event that has deeply affected you. We often hear of veterans being tormented by intrusive thoughts after returning home, but this can also occur after witnessing anything traumatic, a birth or a death, receiving distressing news, or experiencing an event that has shaken your sense of stability.

Something traumatic may have happened that has not yet been processed or “metabolised” within your system. Guilt or shame surrounding the experience may prevent the psyche from fully integrating it, allowing the event to retain its power and hold over you.

Mental health conditions

Conditions such as ADHD, Generalised Anxiety Disorder (GAD), and Obsessive-Compulsive Disorder (OCD) can make intrusive thoughts more common. These conditions are often associated with heightened sensitivity, which can lead to rumination, overthinking, and deep cognitive processing. As a result, individuals may find it more difficult to let go of intrusive thoughts.

Hormonal changes

Life stages involving hormonal shifts – such as adolescence, pregnancy, the postpartum period, and menopause – can also increase the likelihood of intrusive thoughts. During these times, hormones such as dopamine and serotonin may fluctuate significantly. As these hormones play a key role in mood regulation, changes in their levels can heighten anxiety and disrupt the body’s fight-or-flight response.

How do you manage intrusive thoughts?

One approach is to practise not engaging with the thoughts. “Easier said than done,” you might say – and that’s true. However, there are ways to practise this over time.

Start by recognising the thought for what it is: just a thought, nothing more. Some people find it helpful to externalise intrusive thoughts by imagining them as a “gremlin,” a misfiring of the mind, or an unruly chimp. When a thought appears, notice it and, if it helps, label it – “That’s the gremlin again.”

Next, avoid analysing the thought. Intrusive thoughts do not necessarily mean anything significant or dangerous, nor do they require interpretation. If you feel the need to explore them further, therapy can be a safe place to do so. Otherwise, allow the thought to pass without engaging.

Distraction can be helpful, especially activities that are calming yet require focus. Going for a walk, exercising, reading, cooking, or doing something creative can gently shift your attention and allow the thought to fade.

Therapy can also help enormously. One of its core purposes is to process trauma, reduce anxiety, shame, and guilt, and restore balance within the mind. Therapy provides a contained, supportive space where underlying factors contributing to intrusive thoughts can be explored and worked through, promoting greater peace of mind.

Take-home message

Intrusive thoughts are, generally speaking, a normal part of life. However, if they occur frequently and cause distress, it’s important to talk to someone – such as a therapist – about what you’re experiencing.

Persistent intrusive thoughts may be linked to unprocessed trauma, depression, high levels of anxiety, or other underlying issues. A therapist can help you understand and manage these thoughts, reducing their impact on your well-being. Where appropriate, they can also guide you towards additional support or suggest speaking with your GP.

You are not alone. Help is available, and reaching out is a positive and important step.