When we talk about obsessive-compulsive disorder (OCD), we often refer to intrusive thoughts. But I think this term can be a little misleading. It suggests that OCD always involves a recognisable thought popping into our mind, perhaps something like, “What if I've hurt somebody?” or “What if I've forgotten to lock the door?” And while this certainly happens, OCD can be much more complicated than that. In fact, many of the intrusive experiences people describe aren't really thoughts at all, at least not in the conventional sense.
They might be doubts, memories, emotions, physical sensations or even inexplicable urges. Understanding this is important, particularly because someone might not recognise their experiences as OCD simply because they don't seem to be having what they'd describe as intrusive thoughts. So, what else can intrusive experiences look like?
1. Doubts
OCD is sometimes described as the doubting disorder, and for good reason. Many people with OCD experience persistent doubts that feel incredibly important to resolve. These might include:
Did I accidentally hurt somebody?
Do I really love my partner?
Have I done something immoral?
What if I've overlooked something important?
Sometimes these doubts appear as recognisable thoughts or questions. Other times, they're more like a nagging feeling that something isn't quite right. Someone might repeatedly check that they've locked their door, not because they consciously think they left it unlocked, but because they simply don't feel certain. And no matter how many times they check, that certainty never seems to last.
2. Memories
This is another particularly interesting feature of OCD. Sometimes an intrusive experience isn't about something that might happen in the future, but something that may have happened in the past. It might concern something that happened five minutes ago, or something that happened 25 years ago. For example, someone might finish a car journey and suddenly find themselves questioning whether they accidentally hit a cyclist or pedestrian along the way. They might start replaying the journey in their mind, trying to reconstruct exactly what happened. Alternatively, someone might remember something they said or did at a party when they were at school, many years earlier. They may begin questioning whether their behaviour was inappropriate, whether they offended somebody or whether the memory reveals something terrible about their character. Sometimes the memory itself is perfectly ordinary, but the way the person interprets and analyses it becomes obsessive. Other times, they might struggle to remember exactly what happened and become increasingly preoccupied with filling in the gaps. The problem isn't necessarily the memory itself, but the compulsive need to revisit it, analyse it and obtain certainty about what happened or what it means.
3. Feelings and emotions
This is something I think can be particularly confusing for people experiencing OCD. Sometimes an intrusive experience is primarily emotional. It might be a sudden feeling of guilt, shame, fear or dread. Or perhaps an inexplicable sense that something terrible is about to happen. Someone might describe it as a sixth sense, a premonition or simply a feeling that something is wrong. The difficulty is that these feelings can seem incredibly convincing. For example, someone might experience a sudden wave of guilt and begin wondering what they've done wrong. They might think, “Why would I feel so guilty if I hadn't done something bad?” And so they begin reviewing their memories, searching for something that might explain the feeling. Similarly, someone might experience a powerful sense of impending doom and feel compelled to check that their family members are safe. The feeling itself demands an explanation. Of course, experiencing guilt, shame or dread doesn't automatically mean someone has OCD. But when these feelings repeatedly trigger attempts to obtain certainty, prevent harm or neutralise a perceived threat, they can become part of an obsessive-compulsive cycle.
4. Physical sensations
OCD isn't always experienced purely in our minds. Sometimes it can involve very real physical sensations. For example, someone with contamination OCD might describe their hands as feeling dirty, even when there's no obvious reason to believe they're contaminated. They may feel stickiness, a coating of germs, or that contamination has spread from one surface to another. The discomfort can be so convincing that washing feels almost irresistible. Others feel that something simply doesn't feel right. Perhaps an object doesn't feel positioned correctly, or a movement needs to be repeated until it feels complete. There might not even be a particular feared consequence. Instead, the person feels an uncomfortable tension or incompleteness that seems to demand a response. These experiences are sometimes described as not-just-right feelings. And they demonstrate that OCD doesn't always revolve around a clearly identifiable fear or intrusive thought.
5. Urges
Finally, OCD can involve powerful urges that are difficult to explain. Sometimes these are intrusive impulses, such as the unwanted urge to do something the person finds frightening or inconsistent with their intentions. At other times, the urge is to perform a compulsion. For example, someone might feel an overwhelming need to touch something, repeat a movement, check an object or mentally review a particular event. They might not even know exactly what they're afraid of. They just feel strongly that they need to do something. I sometimes think of this as an itch that needs scratching. The urge can be incredibly difficult to resist, and acting on it might provide immediate relief. But, just like repeatedly scratching an itch, responding to these urges can sometimes make them more persistent. In OCD, this can create a cycle where the temporary relief reinforces the need to repeat the behaviour the next time the urge appears.
What do all these experiences have in common?
Although these intrusive experiences can look and feel very different, there's often a similar process keeping the OCD going. An unwanted thought, doubt, memory, feeling, sensation or urge appears. The person feels distress, uncertainty, or a strong sense that something needs to be done. They then respond by checking, seeking reassurance, avoiding something, analysing their thoughts or performing another compulsion. Although this may provide temporary relief, it can reinforce the importance of the original experience and make it more difficult to tolerate in the future. This is why cognitive behavioural therapy (CBT), particularly exposure and response prevention (ERP), focuses so much on changing our responses to these experiences. The aim isn't necessarily to prevent intrusive experiences from happening. Instead, we learn that we don't always need to act on them, analyse them, or find an explanation for them.
And importantly, not every distressing thought, feeling, memory or sensation is a sign of OCD. Understanding the wider pattern, including any compulsions, avoidance and impact on everyday life, is essential. Perhaps we need a broader term than intrusive thoughts? I think intrusive experiences might sometimes be a more helpful description. After all, an unwanted thought is only one way that OCD can manifest. For some people, the most distressing part of their OCD isn't a thought at all. It's a memory they can't stop reviewing, a feeling of guilt they can't explain, a physical sensation they can't tolerate or an urge they feel compelled to satisfy. Recognising this broader range of experiences can help people better understand their OCD, particularly when their symptoms don't fit the familiar stereotypes.
OCD isn't defined by the particular thoughts, feelings or sensations we experience, but by the patterns of responding to them that can keep us trapped.