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Trauma and the Nervous System: Understanding Your Body’s Response

Annie Wright therapy related image
Annie Wright therapy related image
Trauma and the nervous system — Annie Wright, LMFT trauma therapist

Trauma and the Nervous System: An Accessible Introduction

SUMMARY

Your nervous system remembers what your conscious mind has worked very hard to forget. For driven women who grew up in unpredictable or emotionally unsafe environments, the body’s alarm system learned to stay on — and it never fully turned off. This post explains what’s actually happening in your brain and body, why you feel the way you do, and what it takes to help your nervous system learn that the danger has passed.



When Your Body Remembers What Your Mind Wants to Forget

You’re in a meeting. Nothing dramatic is happening — a colleague’s voice rises slightly in frustration, or someone’s phone buzzes three times in a row and the sound cuts through the room. And then something shifts in you that you can’t quite name. Your chest tightens. Your jaw clamps. You’re suddenly hyperaware of the door. The words being spoken become somehow distant, like you’re hearing them from underwater, while your heart pounds as if something is about to go wrong.

Nothing is wrong. You know that, intellectually. But your body doesn’t.

Or maybe it’s quieter than that. You’ve been tired for years — not sleepy, but exhausted in a way that sleep doesn’t fix. You go through your days competent, capable, functional. But there’s a flatness underneath everything. A kind of numbness you’ve learned not to question. A distance from your own life that you chalk up to stress or busyness, because the alternative — that something is still happening inside you, something from a long time ago — feels too complicated to look at directly.

If either of those experiences sounds familiar, what you’re feeling has a name. It’s not weakness. It’s not a character flaw. It’s your nervous system doing exactly what it was built to do — and this post is an accessible introduction to why.

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Trauma, the Nervous System, and Why They’re Inseparable

When most people think about trauma, they think about memory — the story of what happened, the flashback, the nightmare, the intrusive thought. And those are real. But some of the most important trauma researchers alive today have fundamentally shifted our understanding: trauma isn’t primarily a problem of memory. It’s a problem of the body.

DEFINITION
TRAUMA AND THE NERVOUS SYSTEM

Trauma is what happens inside the nervous system when an experience exceeds its capacity to process and integrate. Bessel van der Kolk, MD, psychiatrist and trauma researcher at Boston University School of Medicine and author of The Body Keeps the Score, argues that “the body keeps the score” — meaning that unresolved trauma isn’t stored as a coherent narrative but as sensory fragments, muscle tension, and nervous system states that activate involuntarily, often years after the original event. The nervous system — particularly the autonomic nervous system, which governs our involuntary responses to threat — doesn’t distinguish neatly between past and present. If it learned, at some point, that the world was dangerous, it continues scanning for that danger long after the danger is gone.

Your nervous system is your body’s command center for survival. At its most basic, it’s always asking one question: Am I safe right now? When the answer is yes, it allows the body to rest, connect, digest, and heal. When the answer is no — or even maybe not — it mobilizes resources for protection.

This protection system is ancient. It kept your ancestors alive. And it’s extraordinarily good at its job. The problem isn’t the system itself — it’s when the system gets stuck in threat mode long after the threat is gone. When the body keeps responding to old danger as if it’s happening right now. That’s what we mean when we talk about trauma’s impact on the nervous system: a protective system that can’t find its way back to rest.

The good news — and this is important — is that the nervous system is not fixed. It’s adaptive. It learned, and it can keep learning. Healing is not about erasing what happened. It’s about teaching the nervous system that it’s safe to land.



What the Research Tells Us

Two researchers have done more to shape our understanding of trauma and the nervous system than perhaps anyone else working in the field today.

Stephen Porges, PhD, developmental psychologist and Distinguished University Scientist at Indiana University, developed Polyvagal Theory — a framework that fundamentally changed how clinicians understand the nervous system’s response to threat. Porges PhD identified three distinct states the nervous system can occupy: a social engagement state (when we feel safe and connected), a mobilized threat-response state (fight or flight), and an immobilized shutdown state (freeze or collapse). Crucially, his research showed that these states aren’t simply chosen — the nervous system drops into them automatically, based on cues of safety and danger it detects from the environment, often without our conscious awareness. He called this process neuroception: the body’s unconscious surveillance system, constantly monitoring for threat.

What this means in practice: you don’t always choose to shut down, or freeze, or snap. Sometimes your nervous system makes that decision before your conscious mind has processed what’s happening. Understanding this removes a layer of shame — you weren’t overreacting. Your body was doing its job.

Bessel van der Kolk, MD, psychiatrist and trauma researcher at Boston University School of Medicine and author of the landmark book The Body Keeps the Score, has spent decades documenting how trauma reorganizes the brain and body. His work showed that traumatic memories aren’t stored like regular memories — they’re encoded in the body, in the sensory and emotional systems, rather than in the narrative, verbal parts of the brain. This is why trauma survivors often can’t simply “talk themselves out of” their responses. The body holds what words can’t reach.

Together, the work of Porges PhD and van der Kolk MD points toward the same core insight: healing trauma requires working with the body, not just the mind. Language-based approaches matter, but they’re not the whole story. The nervous system needs to feel safe — not just understand that it is.





Fight, Flight, Freeze, and Fawn — Plain Language



Annie Wright, LMFT — trauma therapist and executive coach

About the Author

Annie Wright, LMFT

LMFT · Relational Trauma Specialist · W.W. Norton Author

Helping ambitious women finally feel as good as their résumé looks.

Annie Wright is a licensed psychotherapist (LMFT #95719) and trauma-informed executive coach with over 15,000 clinical hours. She works with driven, ambitious women — including Silicon Valley leaders, physicians, and entrepreneurs — in repairing the psychological foundations beneath their impressive lives. Annie is the founder and former CEO of Evergreen Counseling, a multimillion-dollar trauma-informed therapy center she built, scaled, and successfully exited. A regular contributor to Psychology Today, her expert commentary has appeared in Forbes, Business Insider, Inc., NBC, and The Information. She is currently writing her first book with W.W. Norton.

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Medical Disclaimer

Frequently Asked Questions

Signs of nervous system dysregulation can include chronic anxiety or feeling "on edge," difficulty sleeping or staying asleep, feeling easily overwhelmed by stress, emotional reactions that seem disproportionate to situations, chronic fatigue or feeling "wired and tired," difficulty concentrating or making decisions, physical symptoms like headaches or digestive issues without clear medical causes, and feeling disconnected from your body or emotions. You might also notice that you cycle between feeling anxious and activated to feeling numb and shut down, or that you have difficulty relaxing even when you're in safe situations.

Nervous system dysregulation can absolutely be healed, though it takes time and the right support. Your nervous system has neuroplasticity - the ability to form new neural pathways and learn new patterns of response throughout your life. With appropriate therapy, regulation practices, lifestyle changes, and sometimes medication, people can learn to regulate their nervous systems and develop resilience. While you may always have some sensitivity to stress, you can develop the skills and awareness to manage your nervous system health effectively.

A normal stress response is proportionate to the current situation and resolves once the stressor is gone. Being triggered involves your nervous system responding to a current situation as if it were a past trauma, often with an intensity that seems disproportionate to what's actually happening. Triggers can cause you to feel like you're back in the traumatic situation, even when you're actually safe. The key difference is that triggered responses are based on past experiences rather than current reality, and they often involve fight, flight, freeze, or collapse responses that feel automatic and difficult to control.

This experience, sometimes called "relaxation-induced anxiety," happens because your nervous system has learned that being alert and vigilant is necessary for safety. When you try to relax, your nervous system might interpret this as dangerous because it's not scanning for threats. This is why stillness feels like falling and the neurobiology of rest resistance can be so challenging for trauma survivors. The key is to start with very gentle, brief periods of relaxation and gradually build your tolerance for calm states while reassuring your nervous system that it's safe to rest.

The timeline for healing varies greatly depending on factors like the type and severity of trauma, how long the dysregulation has been present, your support system, access to appropriate treatment, and your own resilience factors. Some people notice improvements within weeks or months of starting appropriate treatment, while others may need years of consistent work. Healing typically happens in waves rather than linear progress, with periods of improvement followed by plateaus or temporary setbacks. The important thing is to focus on progress rather than perfection and to be patient with your unique healing timeline.

While therapy can be incredibly helpful, especially for complex trauma, there are many things you can do on your own to support nervous system healing. These include practicing breathing techniques, engaging in regular exercise, developing mindfulness practices, creating safety and predictability in your environment, building supportive relationships, and learning about trauma and nervous system regulation. However, if you're dealing with severe symptoms, complex trauma, or if self-help approaches aren't sufficient, professional support can be crucial for healing.

PTSD is a specific mental health diagnosis with particular criteria, including exposure to trauma, intrusive symptoms (like flashbacks), avoidance behaviors, negative changes in thoughts and mood, and changes in arousal and reactivity. Nervous system dysregulation is a broader concept that describes how trauma affects your autonomic nervous system's ability to regulate between calm, activated, and shutdown states. You can have nervous system dysregulation without meeting the full criteria for PTSD, and PTSD always involves nervous system dysregulation. Many trauma survivors have nervous system symptoms that don't fit neatly into PTSD criteria but still significantly impact their lives.

Trauma affects your entire nervous system, which controls many of your body's functions. When your nervous system is dysregulated due to emotional or psychological trauma, it can create very real physical symptoms. Your brain doesn't distinguish between physical and emotional threats - both activate the same stress response systems. Additionally, chronic stress from trauma can contribute to inflammation, immune system dysfunction, and other physical health issues. These symptoms aren't "all in your head" - they're legitimate physical manifestations of how trauma has affected your nervous system.

You might explain that trauma affects the body's alarm system, making it go off even when there's no real danger, or that it's like having a smoke detector that's too sensitive and goes off when you burn toast. You could compare it to how your body might react to a loud noise by jumping, even when you know it's safe - trauma can make your whole nervous system react that way to things that remind it of past danger. Emphasize that it's not something you can just "get over" or control with willpower, but that there are effective treatments and strategies that can help. You might also share educational resources or invite them to a therapy session if appropriate.

Yes, children's nervous systems can definitely be affected by trauma, and in some ways they're more vulnerable because their nervous systems are still developing. Children's brains are more plastic, which means they can be more easily shaped by traumatic experiences, but also that they have greater capacity for healing with the right support. Children might show nervous system dysregulation through behaviors like difficulty sleeping, frequent meltdowns, regression in development, difficulty concentrating, or physical symptoms. The good news is that children often respond very well to trauma treatment, especially when their caregivers are also supported in understanding and responding to their needs.

Sleep is crucial for nervous system regulation and trauma healing. During sleep, your brain processes emotions and memories, your nervous system resets, and your body repairs itself. Trauma often disrupts sleep through hypervigilance, nightmares, or racing thoughts. Poor sleep then makes it harder for your nervous system to regulate during the day, creating a cycle where trauma affects sleep and poor sleep worsens trauma symptoms. Improving sleep hygiene, creating a safe sleep environment, and addressing trauma-related sleep disturbances can significantly support nervous system healing.

Exercise and movement help complete the stress response cycle that trauma can interrupt. When you're in fight or flight mode, your body is prepared for physical action, and movement helps discharge that energy. Exercise also releases endorphins, reduces stress hormones, and can help regulate your nervous system. Different types of movement can have different effects - gentle movement like yoga might help activate your parasympathetic nervous system, while more vigorous exercise might help discharge sympathetic activation. The key is finding movement that feels good in your body and doesn't push you beyond your window of tolerance.

Co-regulation is the process of regulating your nervous system through connection with others who are calm and regulated. It happens naturally when you're around someone whose nervous system is in a balanced state - their regulation can help your nervous system settle and find balance. This is why being around certain people feels calming while being around others feels draining or activating. Co-regulation is how we first learn to regulate as infants through our caregivers, and it remains important throughout life. Seeking relationships with regulated people and eventually becoming a co-regulating presence for others is an important part of healing.

Medication can be helpful for managing symptoms of nervous system dysregulation, such as anxiety, depression, sleep disturbances, or hypervigilance. Medications like antidepressants, anti-anxiety medications, or sleep aids can help stabilize your nervous system enough to engage in therapy and other healing work. However, medication typically works best when combined with therapy and other approaches that address the underlying trauma. Some people find medication very helpful, while others prefer non-medication approaches. The decision should be made in consultation with a qualified healthcare provider who understands trauma.

Look for therapists who have specific training in trauma treatment approaches like EMDR, Somatic Experiencing, or other body-based therapies. They should understand how trauma affects the nervous system, not just thoughts and behaviors. Good trauma therapists will help you feel safe and regulated in sessions, will go at your pace rather than pushing you to talk about trauma before you're ready, and will understand that healing happens through the body as well as the mind. They should be able to explain how trauma affects the nervous system and help you develop regulation skills alongside processing traumatic experiences.

Acute trauma typically results from a single incident and may cause temporary nervous system dysregulation that can heal with appropriate support. Complex trauma results from repeated or prolonged traumatic experiences, often in childhood, and tends to cause more pervasive and long-lasting nervous system dysregulation. Complex trauma often affects your basic sense of safety in the world, your ability to regulate emotions, and your capacity for relationships. It may require longer-term treatment that focuses on building regulation skills and addressing attachment issues alongside processing traumatic experiences.

Yes, nervous system dysregulation can significantly impact your ability to function in work and daily life. You might have difficulty concentrating, making decisions, or managing stress. You might feel exhausted from your nervous system being chronically activated, or you might feel disconnected and unmotivated if you're in a shutdown state. You might have difficulty with relationships, feel overwhelmed by normal responsibilities, or have physical symptoms that interfere with functioning. The good news is that as you heal your nervous system, your functioning typically improves significantly.

There are many discrete regulation techniques you can use in public settings. These include subtle breathing exercises (like extending your exhale), grounding techniques (like feeling your feet on the floor or pressing your hands together), brief mindfulness practices (like noticing five things you can see), or gentle movement (like stretching or walking). You can also excuse yourself to the bathroom for a few minutes of deeper breathing or grounding. The key is having a toolkit of techniques that you can use in different settings and practicing them regularly so they're available when you need them.

It's completely normal to feel overwhelmed when learning about trauma and nervous system effects - this information can be intense and may bring up difficult feelings. Take breaks from reading or learning about trauma, practice self-care and regulation techniques, focus on one small piece of information at a time rather than trying to understand everything at once, and remember that knowledge is power - understanding your nervous system gives you more choice in how you respond to stress. If you feel consistently overwhelmed, consider working with a therapist who can help you process this information at a manageable pace.

Healing is more challenging when you're still in stressful or unsafe situations, but it's not impossible. Focus on what you can control, even if it's small things like your breathing or brief moments of self-care. Develop safety plans and resources for crisis situations. Build support systems outside the stressful situation when possible. Practice regulation techniques that you can use discretely. Work toward changing your situation when it's safe and possible to do so. Remember that even small steps toward healing and self-care matter, and that your situation doesn't have to be perfect for healing to begin.

Progress in nervous system healing might include noticing your triggers without automatically reacting to them, feeling more choice in how you respond to stress, improved sleep or energy levels, better relationships and communication, increased ability to enjoy positive experiences, feeling more present in your body and daily life, and reduced intensity or frequency of trauma symptoms. Progress is often subtle and gradual, so keeping a journal or working with a therapist can help you recognize changes that might not be obvious day-to-day. Remember that healing isn't linear - you might have setbacks that don't mean you're not making progress overall.

Trauma and nervous system dysregulation can contribute to addiction in several ways. People might use substances to self-medicate symptoms like anxiety, depression, or hypervigilance. Substances might temporarily help regulate an dysregulated nervous system, providing relief from chronic activation or shutdown. Addiction can also be a way of avoiding or numbing difficult emotions and memories related to trauma. Additionally, the chronic stress of addiction can further dysregulate the nervous system, creating a cycle where addiction and nervous system dysregulation reinforce each other. Effective addiction treatment often needs to address underlying trauma and nervous system healing.

Yes, nervous system dysregulation can be transmitted across generations through several mechanisms. Parents with dysregulated nervous systems may have difficulty providing the consistent, attuned care that children need to develop healthy regulation. Children learn regulation partly through co-regulation with their caregivers, so they may learn dysregulated patterns. Additionally, emerging research suggests that trauma can create epigenetic changes that affect gene expression and may be passed down to future generations. However, healing your own nervous system can help break these cycles and create healthier patterns for future generations.

Learn about trauma and nervous system regulation so you can understand what they're experiencing. Practice your own nervous system regulation so you can be a co-regulating presence. Avoid trying to fix or rescue them, but offer consistent, patient support. Respect their boundaries and healing process, even if it's different from what you think they should do. Take care of your own wellbeing and seek support when you need it. Encourage professional help when appropriate, but don't pressure them. Remember that healing happens at their pace, not yours, and that your consistent, regulated presence is one of the most helpful things you can offer.

Nervous system activation is a normal physiological response to stress or perceived threat, while anxiety disorders involve persistent, excessive worry or fear that interferes with daily functioning. However, trauma can cause your nervous system to become chronically activated, which can look very similar to anxiety disorders. Many people with trauma histories are diagnosed with anxiety disorders when what they're actually experiencing is nervous system dysregulation from trauma. The treatment approaches can be different - anxiety disorders might be treated primarily with cognitive techniques, while trauma-related nervous system dysregulation often requires body-based approaches that work directly with the nervous system.

Yes, absolutely. Trauma can affect your nervous system even if you don't have clear memories of traumatic events. This is especially common with early childhood trauma, which may not be stored in explicit memory but can still affect your nervous system development. You might have nervous system symptoms like chronic anxiety, difficulty regulating emotions, or physical symptoms without clear memories of what caused them. Your body and nervous system remember even when your mind doesn't. Healing can still occur through working with your current nervous system patterns, even without detailed trauma memories.

During stressful periods, it's especially important to prioritize your regulation practices and self-care. Maintain routines that support your nervous system, like regular sleep, exercise, and regulation practices. Increase your use of regulation techniques during stressful times. Seek extra support from friends, family, or professionals. Be gentle with yourself and lower your expectations for what you can accomplish. Focus on what you can control rather than what you can't. Remember that it's normal for your nervous system to be more reactive during stressful periods, and that this doesn't mean you're not healing or that you're going backward.

Nutrition plays an important role in nervous system health. Stable blood sugar levels support nervous system regulation, so eating regular, balanced meals is important. Certain nutrients like omega-3 fatty acids, magnesium, and B vitamins support nervous system function. Limiting caffeine and alcohol can help with regulation, as both can affect your nervous system's ability to maintain balance. Some people find that certain foods trigger nervous system responses, possibly due to food sensitivities or associations with traumatic experiences. Working with a nutritionist who understands trauma can be helpful for developing an eating plan that supports your nervous system healing.

Yes, creative activities can be very helpful for nervous system regulation and trauma healing. Art, music, dance, writing, and other creative expressions can help process emotions and experiences that are difficult to put into words. Creative activities can help you access and express parts of your experience that might be stored in non-verbal parts of your brain. They can also be regulating and soothing, helping activate your parasympathetic nervous system. Many people find that creative expression helps them feel more connected to themselves and provides a sense of agency and empowerment. Art therapy and other creative therapies are recognized trauma treatment approaches.

You might be ready to help others when you have sufficient stability in your own healing, can maintain appropriate boundaries without taking on others' emotions, aren't triggered by others' trauma stories, have your own support system in place, and are motivated by genuine desire to help rather than your own unmet needs. Consider getting proper training if you want to help others professionally. Start small with informal support or mentoring. Always prioritize your own continued healing and self-care. Remember that your healing journey itself can be helpful to others, even if you're not formally helping them - you model what healing looks like and can offer hope to others who are struggling.

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