There's a phrase I hear fairly often in session, almost always said with a trace of shame: "I don't know why I can't stop thinking about it. It's over. I should be over it by now." Sometimes they're talking about a relationship that ended badly. Sometimes about something someone said years ago that still stings. Sometimes about a childhood situation that shows up unannounced, in dreams or in the middle of a trivial conversation.
What's behind that experience — that inability to let go, that involuntary return — often has a name. And that name is trauma. Even when it doesn't look like it.
Trauma doesn't always take the shape we imagine
When we think of trauma, we tend to imagine extreme events: accidents, disasters, violence, war. And yes, those experiences leave trauma. But Peter Levine, one of the most important researchers in this field and the creator of Somatic Experiencing, proposed a more precise and more useful definition: trauma is what happens when something was "too much, too fast, too soon" for the nervous system to process.
Under that definition, trauma can be growing up in a home where there was no room to express what you felt. It can be a relationship that left you without ground under your feet, unsure of who you were. It can be a moment of public humiliation that was never spoken about, never acknowledged, never processed. It can be the emotional neglect of a caregiver who wasn't cruel, just absent. It can be the accumulated weight of years spent living in an environment where you had to stay on alert.
Trauma, in this sense, isn't what happened. It's what stayed in the body after it happened.
Gabor Maté puts it this way: trauma isn't the wound, it's the scar the wound leaves when it couldn't heal properly. And Bessel van der Kolk adds something I find essential: the traumatized brain gets stuck in time. It doesn't file the experience away as something that already happened and ended. It keeps it active, as if it were still happening. That's why the body responds with urgency to situations that, "rationally," no longer represent danger. That's why the mind returns, again and again, without you asking it to.
Rumination as a symptom of the body, not of character
When someone can't stop thinking about something that happened, the most common interpretation — and the cruelest one — is that something is wrong with that person. That they're weak, that they don't want to let go, that they wallow in the past. That's not just incorrect: it's the opposite of what's actually happening.
Rumination is, in many cases, a physiological symptom. When the nervous system lives through an experience that overwhelms it, it activates defense responses: fight, flight, freeze. If that response can't complete — because the situation didn't allow it, because there was no adult present to contain it, because the danger was the very person who was supposed to protect you — the nervous system is left holding that undischarged energy. Like a file that never finished saving.
And the mind, which doesn't know the problem is somatic, keeps trying to "solve" what the body couldn't complete. It goes back to the event. Replays it. Analyzes it from every angle. Searches for the mistake you made, the sentence you said, the moment everything could have gone differently. Not because you're a masochist. Because the nervous system is still looking for the exit it didn't find back then.
This connects directly to what I work with through Polyvagal Theory and nervous system regulation: as long as the body doesn't feel safe, the mind can't let go. It's not a decision. It's biology.
What can actually be done
The good news — and it's an important one — is that the nervous system can learn to complete what was left unfinished. Trauma isn't a permanent sentence. It's an adaptive response that stayed activated longer than necessary.
What generally doesn't work is reliving the trauma in detail hoping that "getting it all out" will resolve it. That can retraumatize. What works is processing it in small doses, with care, letting the nervous system handle what it can handle at each moment. Levine calls this titration: approaching difficult material the way a scientist approaches a potent substance, in manageable amounts, with attention and time.
In my work I integrate several tools for this. Internal Family Systems — Richard Schwartz's model — offers a very effective way of relating to the internal "parts" that carry the weight of the trauma: the part that freezes, the one that gets angry, the one that tries to protect through hypercontrol. It's not about eliminating those parts, but understanding and accompanying them from a place of greater presence. Body-based therapy and Core Energetics work with the body directly, letting stuck energy find movement and release.
And before all of that, or alongside it, the first step is usually simply this: that the body learns it's safe right now. That the present moment isn't the past. That distinction, which seems obvious from the outside, isn't obvious at all for a nervous system still operating as if the danger were here.
When the past finally stays in the past
Being able to stop thinking about something that happened isn't forgetting it. It isn't pretending it didn't happen or didn't matter. It's something subtler and more liberating: the nervous system finally filing it away as past. That it stops treating it as an active threat. That the story remains yours — with everything it was — but that it no longer controls you from inside.
That's possible. And it doesn't have to take years. But it does require a space where the body feels safe enough to begin letting go.
If this resonates with you, if there's something that keeps showing up uninvited, I invite you to read about what to expect from therapy or to book a first session so we can look together at what your nervous system is carrying and what tools can help you find more freedom.