Trauma & CPTSD5 min read

The window of tolerance — and why it matters in trauma therapy

Too activated, too shut down — trauma keeps us swinging between extremes. The window of tolerance explains why, and how therapy helps widen it.

The 'window of tolerance' is a concept developed by psychiatrist Dan Siegel, and it's one of the most useful frameworks for understanding what happens in the nervous system during and after trauma.

The idea is simple: there's a zone of arousal — a window — within which we can function well. Inside this window, we're able to think clearly, feel our emotions without being overwhelmed by them, connect with other people, and engage with difficult material without shutting down. This is the zone where learning and healing happen.

Outside this window, in either direction, our capacity to function is compromised. Too much activation — the hyperarousal zone — and we're flooded: anxious, reactive, overwhelmed, unable to think straight. Too little — the hypoarousal zone — and we're shut down: numb, disconnected, exhausted, unable to feel much at all.

This is why trauma therapy can't simply involve talking about what happened. If a person is already outside their window of tolerance — flooded or shut down — they can't process the material in a way that leads to healing. They're just re-experiencing it. Good trauma therapy is therefore partly about widening the window.

Practically, this means that early trauma therapy often focuses on stabilisation and resourcing — developing tools for self-regulation, building a sense of safety in the therapeutic relationship, and learning to recognise when you're moving outside your window so you can bring yourself back.

If you've tried therapy before and found it overwhelming or unhelpful, it's possible that the work moved too quickly — before your window was wide enough to hold it. That's not a reflection of your capacity to heal. It's a reflection of the approach. The right pacing makes all the difference.

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