Why Your Body Still Reacts After Stress or Trauma
Drawing on her own healing journey through cancer, Sarah Hurst is a coach and creator of the Mind Medicine Movement™. She helps people calm the nervous system, reconnect with themselves, and take back their power to heal body, mind, and soul.
You can know logically that you are safe and still feel your heart begin to race. A smell, a sound, a hospital corridor, an unexpected comment, or even a date on the calendar can create a physical reaction before you have consciously worked out why. Understanding what is happening can change the way you relate to these moments because your body is not working against you. It is responding to what your nervous system has learnt before.
What is body memory?
We often hear phrases such as “the body keeps the score”, “trauma is stored in the body”, or “the body remembers”. I use this kind of language myself because, experientially, it makes sense. We can feel the past show up physically, sometimes long after we believe we have dealt with it.
Scientifically, though, there is an important distinction to make. Memories are not literally stored inside muscles, fascia, or other tissues independently of the brain. Current neuroscience gives us a more interesting explanation: the brain and nervous system learn associations from our experiences, and when something in the present resembles a previous threat, they can recreate the physical response that helped protect us before.
That might sound like semantics, but I think it actually makes the idea more empowering. Your body is not a container full of trapped trauma that somehow needs to be emptied. Your nervous system is capable of learning, adapting, and, importantly, learning something new.
When I talk about the body remembering, this is what I mean. An experience can become associated with sensations, sounds, smells, places, or situations, and those cues can later activate a response before our thinking mind has caught up.
Why reactions feel automatic
Imagine you have been through months of chemotherapy. There are hospital rooms, particular smells, cannulas, machines, waiting areas, conversations, and perhaps moments when you felt frightened or very unwell.
Months later, you may walk into a hospital for a routine appointment and suddenly notice your stomach turning. Perhaps your heart beats faster or your breath becomes shallow. Your conscious mind may be saying, “I’m only here for a checkup,” but another system has already recognised something familiar.
This is not imaginary. The National Cancer Institute (NCI) explains that cancer-related post-traumatic stress symptoms can develop through conditioning, where previously neutral sights, sounds, or smells become associated with difficult treatment experiences. Later, those cues can produce anxiety, fear, or stress even when the original event is no longer happening.
The National Cancer Institute even describes conditioned reactions to chemotherapy reminders, including anxiety and nausea triggered by particular smells and sights. That is an extraordinary example of how closely memory, emotion, sensation, and the nervous system are connected.
The body reacts first
One of the frustrations people often have is, “But I know I’m safe, so why am I still reacting like this?” It can feel irrational, particularly when you have done a lot of mindset work and understand perfectly well what is happening.
The problem is that knowing something intellectually and experiencing it physiologically are not always the same thing. Our protective systems are fast. When the brain detects something associated with previous danger, the nervous system can mobilise before we have had time to reason through the situation.
The National Institute of Mental Health describes how reminders of traumatic experiences can bring back not only thoughts and memories but also physical signs of stress, including a racing heart, sweating, and feeling tense or on guard. Words, objects, and situations can all act as reminders.
This is one reason I am so interested in the gap between what we know and what we actually feel. You can know that you are safe. You can know that the scan is precautionary. You can know that one difficult conversation does not mean everything is falling apart. Yet your body may be responding to an older piece of information.
Cancer leaves associations
Cancer is particularly interesting in this context because it is rarely one isolated frightening event. There may be a diagnosis, treatment, surgery, scans, waiting for results, recurrence fears, and repeated appointments stretching over months or years.
The National Cancer Institute recognises this explicitly. Cancer-related post-traumatic stress can occur at different points, from diagnosis through treatment, afterward, and during recurrence. Not everyone who experiences these responses develops post-traumatic stress disorder (PTSD).
That distinction is important. Feeling anxious before a scan does not automatically mean you have a trauma disorder. Feeling emotional when you smell something that reminds you of chemotherapy does not mean something is wrong with you. Sometimes it simply means your nervous system has learnt that this particular cue once arrived alongside uncertainty or threat.
I experienced this in my own journey. There were times when my rational mind could understand exactly what was happening, while my body seemed to be somewhere completely different. Panic taught me very quickly that telling myself to “calm down” was not enough. That understanding eventually became central to the way I work today.
Why thinking isn't enough
Mindset matters enormously to me, but I think we can misunderstand mindset if we reduce it to changing our thoughts. Sometimes people have already understood their pattern. They have analysed it, journalled about it, and explained exactly where it came from, yet their body still responds.
That does not mean the inner work has failed. It may simply mean another part of the experience needs attention.
This connects with something I wrote about in my Brainz article on nervous system healing. The nervous system does not respond to logic alone. It responds to experience, and sometimes we need to give the body a different experience rather than another explanation.
That is why I am interested in both top-down and bottom-up ways of working. Thoughts, beliefs, and narrative matter, but so do breath, sensation, movement, environment, safe relationships, and touch. We are not a mind sitting on top of a body. The two are continually informing each other.
Triggers are information
The word “trigger” is used so casually now that I think we sometimes forget what it actually describes. A trigger is not simply something we dislike. It is a cue that evokes a response connected to previous learning or experience.
That cue can be obvious, such as entering the hospital where you had treatment. It can also be surprisingly subtle. A tone of voice, a smell, a piece of music, lying in a particular position, receiving a letter through the door, or hearing the phone ring at a certain time may all carry associations we have not consciously noticed.
Rather than immediately asking, “How do I stop this reaction?” I often find it more useful to begin with curiosity. What just happened? What did I notice in my body? What might my nervous system have recognised?
That shift matters because judgement adds another layer of threat. Curiosity creates a little space between the sensation and the story we immediately attach to it.
This does not mean that every unexplained physical symptom is emotional or related to trauma. New, persistent, or concerning physical symptoms always deserve appropriate medical assessment. It simply means that once physical causes have been considered, our emotional and nervous system experiences may also be part of the wider picture.
Safety creates new learning
If the nervous system can learn danger, it can also learn safety. For me, this is one of the most hopeful parts of understanding how these responses work.
It does not usually happen because we force ourselves to relax. New learning develops through repeated experiences in which something that once felt threatening occurs alongside greater safety, support, or choice.
That may be as simple as noticing your feet on the ground while you wait for an appointment. It might involve slowing the breath, looking around the room, and orienting yourself to the present rather than disappearing into the memory of what happened before. It may mean bringing someone safe with you, telling the medical team you feel anxious, or giving yourself permission to step outside for a moment.
These are small things, but small things matter to the nervous system. They begin adding new information alongside the old.
This is also why my work places so much emphasis on slowing down. In Why Healing Begins With Gentle SIPS™, I explain that Slow Down comes first because, without space, it becomes very difficult to notice what is actually happening within us.
Why safe touch helps
Touch is another form of experience, and for some people, it can offer a powerful sense of grounding and connection. Safe, consensual touch gives the nervous system sensory information in the present moment.
This does not mean massage or touch therapy is a treatment for trauma or PTSD. Those conditions may need support from an appropriately qualified mental health professional. But within its proper scope, safe therapeutic touch can help someone experience their body differently, perhaps as somewhere they can inhabit rather than somewhere they constantly monitor.
This became particularly important to me after cancer. Illness can profoundly alter the relationship we have with our bodies. After examinations, procedures, surgery, and treatment, the body can begin to feel medicalised, watched, or even mistrusted.
In my article on how Touch Therapy supports nervous system regulation, I explored how attuned, consensual touch can become part of rebuilding body trust. For me, this is less about “releasing stored trauma” and more about giving the nervous system another experience, one associated with choice, gentleness, and safety.
The senses remember too
Smell is perhaps the clearest example of how quickly a sensory cue can transport us somewhere else. One moment you are standing in the present, and the next, a familiar smell has brought back an entire emotional atmosphere.
The same can happen through sound, sight, taste, and touch. This is one reason I have become increasingly interested in the senses within my Mind Medicine work. The senses can alert us to danger, but they can also become routes back towards safety.
A familiar piece of music can soften something. The smell of an essential oil you associate with calm can create a moment of recognition. Warmth, a soft blanket, natural light, birdsong, the feeling of the ground beneath your feet, or the rhythm of slow breathing can all become part of the present experience.
I don't see these things as magic tricks that erase the past. I see them as ways of helping the body notice that this moment is not that moment.
With repetition, the nervous system has an opportunity to build a wider library of experiences. The old association may still exist, but it does not necessarily have to remain the only association.
When support is needed
There is an important distinction between experiencing occasional nervous system reactions and living with symptoms that are significantly affecting daily life. Persistent flashbacks, nightmares, severe avoidance, ongoing hypervigilance, or distress that interferes with relationships, sleep, or everyday functioning deserve professional support.
The National Institute of Mental Health advises seeking help when symptoms related to trauma do not improve or begin to interfere with daily life. Evidence-based treatments for PTSD include therapies focused on trauma, and a qualified mental health professional can help determine what support is appropriate.
For those whose responses are less severe, understanding the nervous system can still be enormously reassuring. What once felt random begins to make more sense, and that understanding can remove some of the fear around the reaction itself.
You stop asking, “What is wrong with me?” and begin asking, “What has my system learnt, and what might help it learn something different?”
Teaching safety again
Perhaps this is what I now mean when I say that the body remembers. Not that the past is physically trapped somewhere inside us, waiting to be dug out, but that our whole mind and body system learns from experience.
Sometimes it learns that a particular smell means danger, that hospitals mean bad news, that conflict means abandonment, or that slowing down is unsafe. Those associations may once have served a protective purpose, but they do not have to dictate the rest of our lives.
Healing can involve gently updating that information. Through awareness, nervous system regulation, therapeutic support, safe relationships, and new embodied experiences, we can begin showing ourselves that the present is different from the past.
If you notice your body reacting before your mind understands why, try not to immediately fight the response. Pause long enough to notice it, look around you, feel where you are now, and ask yourself, “What would help me feel five per cent safer in this moment?”
You do not need to force your body to forget what happened. Perhaps the more compassionate task is to help it discover something new.
If you are navigating cancer, illness, or another major life experience and would value support in reconnecting with your body and creating a greater sense of safety, you can explore my coaching, meditation, and Mind Medicine work through my Brainz profile and website.
Read more from Sarah Hurst
Sarah Hurst, Coach & Creator of the Mind Medicine Movement™
After walking her own path through cancer, Sarah Hurst discovered that true healing isn’t just physical, it’s emotional, spiritual, and deeply personal. She went on to create the Mind Medicine Movement™, helping others calm their nervous systems, rediscover purpose, and reconnect with themselves through her SIPS™ framework: Slow Down, Identity, Purpose, Self-Love. Today, Sarah supports people living with or beyond cancer and anyone seeking calm, clarity, and wellness through her coaching, meditation, and touch therapy practice in Hove, East Sussex. She also offers an online coaching service.
