Why the Body Holds Onto Trauma
- Aug 18
- 3 min read
The body holds onto trauma because the nervous system stores threat responses physically, not just as memories: meaning a person can feel unsafe long after the danger has passed, even without consciously remembering why.
This is the foundation of why somatic (body-based) approaches often reach what talk therapy alone can't.
The Nervous System Doesn't Wait for Permission
When we encounter something threatening, the nervous system doesn't check in with rational thought first: it reacts. This is governed largely by the autonomic nervous system, which runs the body's automatic survival responses: fight, flight, freeze, or collapse. These responses happen in milliseconds, well before conscious awareness catches up.
The problem isn't that this system activates during danger: that's exactly what it's supposed to do. The problem is what happens when that activation doesn't get to complete. In nature, an animal that escapes a threat will often visibly shake or tremble afterward — literally discharging the surge of survival energy. Humans, especially in situations where fighting or fleeing wasn't possible or safe, often don't get that same release. The energy the nervous system mobilized has nowhere to go, so a piece of it stays "on."
Polyvagal Theory, in Plain Terms
Polyvagal theory (developed by Dr. Stephen Porges) offers a useful map for this. In simple terms, it describes three main nervous system states:
Ventral vagal (safety/connection): calm, socially engaged, able to think clearly and connect with others
Sympathetic (mobilization): fight-or-flight; alert, activated, ready to act
Dorsal vagal (shutdown): freeze/collapse; numbness, dissociation, disconnection when fight or flight isn't an option
Trauma can leave the nervous system stuck cycling between sympathetic activation and dorsal shutdown, with less and less access to that ventral, safe-and-connected state: even in situations that are, in the present moment, genuinely safe. This isn't a character flaw or a failure of willpower. It's a nervous system doing exactly what it learned to do to survive.
Why The Body Holds Trauma: Resulting in Physical Symptoms
This is also why unresolved trauma so often shows up as physical experience, not just emotional memory: a tight chest, a clenched jaw, chronic fatigue, digestive issues, or pain that doesn't have a clear medical cause. The nervous system isn't speaking in words: it's speaking in sensation, tension, and physiological state.
Why Somatic Work Addresses This Directly
Because trauma is stored and expressed physically, working only at the level of thought and narrative can leave the underlying nervous system pattern untouched. Somatic approaches work the other direction: starting with body awareness and gently helping the nervous system complete the responses it wasn't able to finish, and rebuild access to that calmer, connected state.
This doesn't mean talking about what happened isn't valuable: it often is. It means the body itself needs its own kind of attention, not just the mind's account of events.
What This Means for You
If you've done talk therapy and still feel like something is "stuck": reactive, numb, on edge, or disconnected from your own body — that's not a sign therapy failed. It may be a sign the piece that hasn't been addressed yet lives below the level language can fully reach.
Frequently Asked Questions:
Why does the body hold onto trauma?
The body holds onto trauma because the nervous system stores threat responses physically, not just as memories, meaning a person can feel unsafe long after the danger has passed, even without consciously remembering why.
What is polyvagal theory?
Polyvagal theory, developed by Dr. Stephen Porges, describes three main nervous system states: ventral vagal (safety and connection), sympathetic (fight-or-flight mobilization), and dorsal vagal (freeze or shutdown).
Can trauma cause physical symptoms?
Yes. Unresolved trauma often shows up physically as a tight chest, clenched jaw, chronic fatigue, digestive issues, or pain without a clear medical cause, since the nervous system communicates through sensation and physiological state.
How does somatic therapy address trauma stored in the body?
Somatic approaches start with body awareness and help the nervous system complete survival responses it wasn't able to finish, gradually rebuilding access to a calmer, more connected state.
Sarah Bibbo is a somatic therapist based in West LA specializing in nervous system regulation and trauma.
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