What’s Going On When You Can’t Stop Overthinking

You are lying in bed and your mind is running through tomorrow's meeting for the fourth time. You have already planned what you are going to say. You have already thought through what could go wrong. You have already rehearsed how you would handle the worst-case scenario. 

And still, your brain goes back to the beginning and runs it again. 

Or maybe it is not a meeting. Maybe it is a conversation you had three days ago, and you are still dissecting what you said, what they said, what their tone meant, and whether you should have said something differently. 

Or maybe it is not even anything specific. It is just a low hum of mental noise, one thought leading to the next, to the next, to the next, never arriving anywhere, never resolving, never stopping. 

If you have tried to stop overthinking by telling yourself to stop, you have probably noticed that it does not work. If anything, it makes it worse. 

There is a reason for that.

Most advice about overthinking treats it as something you are choosing to do. A bad habit. A thinking problem that can be fixed by thinking differently. 

But overthinking is not a choice. It is a process your brain runs automatically when it detects unresolved threat. 

In an earlier post, I described anxiety as a state of being, generated by the interaction of how you experience the world, what you feel emotionally, what happens in your body, and what you do. Overthinking is what happens when the first of those, your subjective reality, gets locked into threat-scanning mode. 

Your brain is designed to identify risks and work through them. That is useful. When you are facing a genuine risk, thinking it through helps you plan, prepare, and protect yourself.

The difficulty is that this process does not have a natural off switch. It keeps running until it finds a resolution. And when the threat is uncertain, ambiguous, or imagined, there is no resolution to find. So the loop keeps going. Your brain keeps searching for an answer that does not exist, generating more anxiety as it goes, which signals more threat, which triggers more scanning. 

Overthinking is not the problem. It is the symptom of a system that cannot find safety.

This is one of the most frustrating things about overthinking. The more you try to stop, the louder it gets.

There is good research on why this happens. When you try to suppress a thought, your brain has to monitor for the thought in order to know whether it has successfully suppressed it. That monitoring process keeps the thought active. It is like trying not to think about a white bear, the instruction itself keeps the bear in your mind.

But there is a deeper layer to it as well. When you tell yourself to stop overthinking, you are essentially asking your conscious mind to override a process that is being driven by something underneath - your nervous system's assessment that there is an unresolved threat. 

Your conscious mind says, "stop worrying about this." Your survival system says, "I have not finished assessing whether this is safe." And because the survival system's job is survival, it wins. Every time. 

This is why changing your thinking alone is often not enough. The overthinking is not generating the anxiety. The anxiety is generating the overthinking. And until the underlying state shifts, the loop continues.

If you mapped out what is happening when you are caught in an overthinking spiral, it would look something like this. 

The loop sustains itself. Each element feeds the next. And because the process feels like productive thinking, like you are working on the problem, it can be hard to recognise that it is actually keeping you stuck rather than moving you forward.

If overthinking were simply a thinking problem, everyone would do it equally. But they do not. Some people can have an uncertain thought, sit with it briefly, and let it go. Others get pulled into hours of mental rehearsal over the same uncertainty.

The difference is not intelligence or willpower. It is how your system has learned to relate to uncertainty. 

If your early experiences, your environment, or your history taught your nervous system that uncertainty is dangerous, that mistakes lead to serious consequences, or that you need to anticipate every possible outcome in order to stay safe, your brain will have developed a strong bias toward scanning. Overthinking is not a flaw. It is a strategy your system learned because, at some point, it made sense. 

The problem is that the strategy has outlived the context it was built for. You are no longer in the environment where you needed to be that vigilant. But your system has not updated. The predictions are still running on old data, and so the scanning continues, even when there is nothing to find.

For many people, overthinking sits in the background as a constant drain, exhausting but manageable. They push through it, work around it, and keep going. 

This is often what high-functioning anxiety looks like. You are still performing, still delivering, still holding everything together. But the mental effort required to do so is enormous. You are running two processes at once, the task itself and the anxious scanning that surrounds it. No wonder you feel tired. 

For others, overthinking becomes so intense that it tips into paralysis. The volume of mental noise gets so loud that action becomes impossible. Decisions stall. Tasks pile up. The system, overwhelmed by its own scanning, shuts down (low-functioning anxiety). 

And for some people, it moves between the two. Weeks of pushing through followed by a crash. High functioning on the outside, then suddenly unable to get started on anything at all. 

If any of these patterns are familiar, the Problematic Worry Support page goes into more detail about how this cycle works and what one-to-one support can look like.

If overthinking is being driven by an underlying state of anxiety, and that state is being maintained by the interaction of your subjective reality, your emotions, your physiology, and your behaviour, then interrupting the loop requires more than thought management.
It requires working with the whole pattern. 

In my one-to-one work with clients, coaching helps identify the specific triggers and cycles that keep your overthinking going. It brings clarity to what your system is actually scanning for, what it is trying to protect you from, and where the avoidance and safety behaviours are keeping the loop in place. That clarity alone can begin to create space between you and the spiral. 

Clinical hypnotherapy goes further. It works with the nervous system directly, helping to settle the underlying state of alert that is driving the need to scan. When the system begins to register that it is safe, that uncertainty does not have to be resolved immediately, that not everything requires a threat assessment, the scanning can begin to quieten. Not because you are forcing it to stop, but because the conditions that were driving it have started to change. 

The two approaches work together because the loop operates at both levels, the patterns you can see and the responses that fire before you are aware of them.

If you are an overthinker, you have probably already started analysing this post. Running it through your own experience, checking whether it applies, wondering whether seeking support would be the right move or whether you should think about it a bit more first. 

That impulse, right there, is the loop. 

You do not need to have it all figured out before you take action. A 30-minute consultation with me provides a low-pressure introduction to a way forward. It's a way to talk through what has been happening and see whether my Nervous System Coaching Program might be the right fit for you. No preparation needed. No decision required on the day. 

Sometimes the most useful thing an overthinker can do is stop researching and start a conversation.

This is the second post in an ongoing series exploring the specific ways anxiety shows up in daily life. The next post looks at why anxiety gets worse at night, and what is actually happening when the distractions drop away and your nervous system has your full attention.

Important Information: This blog post is for general informational purposes only. It does not constitute medical advice, diagnosis, or treatment. If you are experiencing persistent anxiety or have concerns about your mental health, please consult your registered health practitioner. If you are experiencing a mental health crisis or have urgent concerns about your safety, contact your GP or local emergency services immediately.