People with more adverse childhood experiences have measurably more chronic pain in adulthood. Not because pain is imagined. Because adversity literally rewires the alarm system to run hotter, for longer, with less provocation.
"Have you thought about whether this might be stress-related?"
If you have chronic pain, someone has probably said this to you. A GP. A specialist. A well-meaning friend. And when they said it, something inside you recoiled — because what you heard was not what they said. What you heard was: "This is your fault. You're making it up. If you just relaxed, it would go away."
That interpretation is understandable. In a healthcare system that treats pain as either "real" (structural, visible, scannable) or "psychological" (imagined, exaggerated, your problem), any suggestion that stress or life experience contributes to pain sounds like an accusation. It sounds like you're being told it's all in your head.
This article will show you that the opposite is true. Your life experiences — your childhood, your trauma, your chronic stress, the accumulated adversity you have survived — have physically, measurably, neurobiologically changed your nervous system in ways that make chronic pain more likely, more severe, and more persistent. These changes are as real as a broken bone. They show up on brain scans. They manifest in blood tests. They are documented across hundreds of peer-reviewed studies involving hundreds of thousands of participants.
Your pain is real. Your pain is physical. And your pain is not your fault.
Understanding why your nervous system runs the way it does is not an accusation. It is the single most important step toward changing it.
In the mid-1990s, Vincent Felitti at Kaiser Permanente and Robert Anda at the Centers for Disease Control and Prevention conducted one of the most important epidemiological studies in the history of medicine. It was called the Adverse Childhood Experiences (ACE) study, and it involved over 17,000 participants.
The study asked adults a simple set of questions about their childhood: Did you experience physical abuse? Emotional abuse? Sexual abuse? Neglect? Did you witness domestic violence? Did a parent have a mental illness, substance abuse problem, or go to prison? Did your parents separate or divorce?
Each "yes" counted as one ACE. The researchers then correlated ACE scores with adult health outcomes.
The results were staggering.
ACE scores predicted adult chronic pain in a graded, dose-response fashion. The more adverse childhood experiences, the higher the likelihood of chronic pain conditions in adulthood — including chronic headache, back pain, fibromyalgia, and chronic pelvic pain. An ACE score of four or more approximately doubled the risk of chronic pain compared to an ACE score of zero.
But the study found much more than pain. Higher ACE scores predicted heart disease, diabetes, autoimmune disorders, depression, substance abuse, and early death. A person with an ACE score of six or more had a life expectancy twenty years shorter than a person with an ACE score of zero.
Twenty years. Not because of genetics. Not because of bad luck. Because of what happened to them as children.
The ACE study has been replicated and extended globally, with consistent findings across cultures, countries, and populations. It is one of the most robust findings in modern epidemiology. And its implications for chronic pain are profound.
The connection between childhood adversity and adult chronic pain is not mysterious. It is not "psychological" in the dismissive sense. It is neurobiological — a series of documented, measurable changes to the nervous system, the immune system, and the endocrine system that are produced by chronic stress during critical developmental periods.
The hypothalamic-pituitary-adrenal (HPA) axis is the body's central stress response system. When threat is detected, the hypothalamus releases corticotropin-releasing hormone (CRH), which triggers the pituitary to release adrenocorticotropic hormone (ACTH), which triggers the adrenal glands to release cortisol. Cortisol mobilises energy, suppresses non-essential functions (digestion, reproduction, immune surveillance), and prepares the body for fight or flight.
In a healthy system, the HPA axis activates in response to acute threat and then stands down when the threat passes. Cortisol levels return to baseline. The system resets.
In children exposed to chronic adversity — abuse, neglect, household dysfunction, unpredictable caregiving — the HPA axis is activated repeatedly and persistently during critical developmental windows. The system doesn't get a chance to reset. And it adapts — not by becoming stronger, but by becoming dysregulated.
Heim et al. (2000) demonstrated that adults with a history of childhood abuse showed altered cortisol responses to stress — in some cases, an exaggerated cortisol response (hyperreactivity), and in others, a blunted cortisol response (hyporeactivity, suggesting the system has been exhausted by chronic activation). Both patterns are associated with increased pain sensitivity, impaired immune function, and elevated inflammation.
The HPA axis is, in effect, a thermostat. In children raised in safe, predictable environments, the thermostat is calibrated to a moderate setting — responsive when needed, quiet when not. In children raised in threatening, unpredictable environments, the thermostat is set too high, or its calibration mechanism is damaged. It runs hot. It runs continuously. It produces cortisol — and the downstream effects of cortisol — at levels and durations that the system was never designed to sustain.
This is not a choice. This is not a personality trait. This is a physiological adaptation to an unsafe environment, made by a developing nervous system that had no option but to adapt to the conditions it was given.
The amygdala — the brain's threat detection centre — shows structural and functional changes in individuals with high ACE scores. Tottenham and Galván (2016) reviewed the evidence and found that early adversity produces amygdala hyperreactivity — an increased sensitivity to potential threats, a lower threshold for activation, and a faster, stronger response to ambiguous stimuli.
An amygdala calibrated by adversity doesn't just respond to clear threats. It responds to uncertainty, ambiguity, novelty, and social cues that might indicate danger. It interprets neutral facial expressions as threatening. It scans constantly. It activates the sympathetic nervous system preemptively, producing the autonomic arousal — elevated heart rate, muscle tension, vigilance — that characterises the chronic threat state.
For pain processing, the implications are direct. Pain is not just a sensory experience — it is a threat experience. The amygdala's evaluation of threat determines how much pain the brain produces. An amygdala that is calibrated to detect threat everywhere will evaluate pain signals as more dangerous, producing more pain output, more protective behaviour, and more sympathetic activation. The same nociceptive input — the same signal from the same tissue — produces more pain in a person whose amygdala has been shaped by adversity than in a person whose amygdala was calibrated in safety.
The prefrontal cortex (PFC) — the brain region responsible for executive function, emotional regulation, and top-down modulation of threat responses — is among the last brain regions to mature, completing its development in the mid-twenties. This extended developmental window makes the PFC particularly vulnerable to the effects of chronic stress during childhood and adolescence.
Arnsten (2009) demonstrated that chronic stress impairs prefrontal function through excessive catecholamine release, effectively taking the brain's executive centre offline. In adults with high ACE scores, the PFC shows reduced grey matter volume, reduced functional connectivity with the amygdala, and impaired capacity to regulate emotional and threat responses.
The PFC is the brake on the amygdala. It is the system that evaluates threat signals and says, "This is not actually dangerous. Stand down." When the PFC is impaired — by adversity, chronic stress, sleep deprivation, or pain itself — the amygdala runs unchecked. Threat signals are amplified. Pain signals are amplified. Protective responses are sustained beyond their useful duration.
A child raised in adversity develops a powerful accelerator (hyperactive amygdala) and a weak brake (impaired PFC). The result is a nervous system biased toward threat detection, protection, and alarm — a system that runs hotter, longer, and with less capacity for self-regulation. This is not a personality type. It is a measurable neuroanatomical and neurochemical profile produced by environmental conditions during development.
Childhood adversity produces lasting changes in the immune system. Danese and Lewis (2017) conducted a meta-analysis of 25 studies and found that childhood maltreatment was associated with elevated levels of C-reactive protein (CRP) and interleukin-6 (IL-6) in adulthood — markers of systemic inflammation that persist decades after the adversity occurred.
This chronic low-grade inflammation has direct relevance to pain. Inflammatory mediators sensitise nociceptive neurons, activate spinal glial cells, promote central sensitisation, and impair descending pain modulation. The immune system, shaped by early adversity, produces a sustained inflammatory environment in which pain signals are amplified, pain thresholds are lowered, and pain conditions are more likely to develop and persist.
The inflammation is not caused by tissue damage. It is caused by immune system programming — epigenetic changes produced by early stress that alter gene expression in immune cells for years or decades after the original adversity. The body is not fighting an infection. It is running an inflammatory program that was installed by childhood experience and never switched off.
The field of epigenetics has provided the molecular mechanism linking early adversity to adult pain. Epigenetic changes — chemical modifications to DNA and histone proteins that alter gene expression without changing the DNA sequence itself — are produced by environmental experience, including stress.
McGowan et al. (2009) studied postmortem brain tissue from suicide victims with and without histories of childhood abuse. They found that abuse was associated with increased methylation of the glucocorticoid receptor gene (NR3C1) in the hippocampus — a change that reduces the number of cortisol receptors and impairs the body's capacity to regulate cortisol levels. This single epigenetic modification explains, at a molecular level, why the HPA axis becomes dysregulated in individuals with high ACE scores.
Epigenetic changes are not mutations. They are regulatory modifications — switches that turn genes up or down in response to environmental signals. They are designed to adapt the organism to its environment. A nervous system that develops in a dangerous environment epigenetically programs itself for danger — more inflammation, more cortisol, more threat sensitivity, faster alarm activation. These adaptations are protective in the original dangerous environment. They become pathological when the environment changes but the programming persists.
The critical finding: epigenetic changes are reversible. Unlike mutations, epigenetic modifications can be altered by subsequent environmental experience. Exercise, sleep, social connection, psychological therapy, meditation, and — critically — the therapeutic relationship itself have all been shown to produce measurable epigenetic changes in stress-related gene expression. The thermostat can be adjusted.
This is the most hopeful finding in the entire adversity-pain literature: the changes are real, they are physical, they are measurable — and they are not permanent.
Childhood adversity is not the only life experience that shapes the nervous system. Adult trauma — motor vehicle accidents, assault, military combat, domestic violence, medical trauma, natural disasters, sudden bereavement — produces many of the same neurobiological changes through the same mechanisms.
The relationship between post-traumatic stress disorder (PTSD) and chronic pain is one of the strongest comorbidity associations in clinical medicine. Fishbain et al. (2017) found that chronic pain patients have PTSD at rates far exceeding the general population, and that the two conditions share overlapping neural mechanisms: amygdala hyperreactivity, HPA axis dysregulation, reduced prefrontal function, neuroinflammation, and disrupted sleep.
In many cases, the trauma and the pain are not separate events that coincidentally co-occur. They are causally linked — not because the trauma "caused" the tissue damage, but because the trauma changed the nervous system in ways that amplify, maintain, and perpetuate pain processing. A motor vehicle accident can produce both a whiplash injury (Hardware) and a traumatic stress response (Software). The tissue heals. The stress response may not — particularly if it is not identified and treated.
Clinicians who treat chronic pain without screening for trauma are treating one dimension of a multi-dimensional problem. And the dimension they're missing is often the one driving the persistence of the pain.
There is a reason this article is called "Your Pain Is Not Your Fault." It is because the implications of the adversity-pain connection are routinely misunderstood — by patients, by clinicians, and by society — in ways that produce harm.
Misunderstanding 1: "If trauma causes pain, then the pain is psychological." Wrong. The pain is neurobiological. The changes produced by adversity are as physical as a fracture. They show up on brain scans, in blood tests, in genetic assays. Saying that adversity contributes to pain is not saying the pain is imagined. It is saying that the nervous system has been physically altered by experience, and that alteration influences pain processing. This is no different from saying that diabetes increases the risk of neuropathic pain — a physical condition increasing pain vulnerability through a physical mechanism.
Misunderstanding 2: "If childhood caused it, I'm broken beyond repair." Wrong. The neurobiological changes are produced by neuroplasticity — the brain's capacity to reshape itself in response to experience. The same neuroplasticity that allowed adversity to change the nervous system allows therapeutic experience to change it back. Recovery is not about undoing childhood. It is about providing the nervous system with new experiences — safety, connection, movement, understanding — that update its programming.
Misunderstanding 3: "I should be over it by now." This fundamentally misunderstands the nature of the changes. Epigenetic modifications, HPA axis dysregulation, and amygdala hyperreactivity are not emotional states that you can "get over" through willpower. They are physiological adaptations that require specific interventions — therapy, exercise, sleep, social connection, and time — to modify. Expecting someone to "get over" neurobiological changes produced by childhood adversity is like expecting someone to "get over" insulin resistance. It is a failure of understanding, not a failure of character.
Misunderstanding 4: "Asking about trauma is re-traumatising." When done inappropriately — without informed consent, without clinical skill, without a therapeutic relationship — discussing trauma can indeed be harmful. But trauma-informed care is not about forcing disclosure. It is about creating safety, offering choice, understanding the potential role of adversity in the pain presentation, and adapting treatment accordingly. A clinician does not need to know the details of your trauma to provide trauma-informed care. They need to know that adversity shapes the nervous system, that your nervous system may be running hot because of experiences you did not choose, and that treatment needs to account for this.
Trauma-informed pain treatment is not trauma therapy. It is pain treatment that recognises, accounts for, and adapts to the neurobiological effects of adversity. Any clinician can be trauma-informed. It is a lens, not a specialty.
Safety first. Before any physical assessment, before any treatment, before any education — establish safety. Physical safety (the treatment environment is predictable, the patient has control, consent is explicit and ongoing). Emotional safety (the patient is believed, validated, and not judged). Relational safety (the therapeutic relationship is consistent, reliable, and trustworthy). For a nervous system calibrated by adversity, safety is not a background assumption. It is the first and most important intervention.
Predictability and control. A nervous system shaped by unpredictable adversity is hypervigilant for surprise and loss of control. Treatment should be predictable: explain what will happen before it happens, explain why, and offer the patient genuine choice and control at every step. "I'd like to examine your lower back. Can I touch you here? You can stop me at any time." This is not just good manners. It is a neurobiological intervention — each moment of control is a SIM, a safety signal that tells the alarm system the environment is safe.
Pacing and gradualism. A dysregulated nervous system cannot tolerate large changes or sudden challenges. Treatment should be graded — small steps, consistent progression, regular check-ins. The goal is not to push beyond the window of tolerance (the zone within which the nervous system can process challenge without becoming overwhelmed) but to gently expand it over time.
Education with sensitivity. Pain neuroscience education — explaining how the nervous system produces pain — should be delivered with an awareness that the patient may have a history of being told their pain "isn't real." Start with validation. Affirm that the pain is real, physical, and not imagined. Then introduce the concept that the nervous system's calibration is influenced by life experience — without blame, without judgment, and without requiring disclosure of specific events.
Referral when appropriate. Some patients will benefit from trauma-specific psychological therapy — EMDR (Eye Movement Desensitisation and Reprocessing), trauma-focused CBT, somatic experiencing, or other evidence-based trauma therapies. The pain clinician does not need to provide this therapy themselves. They need to recognise when it might be beneficial, discuss it with the patient in a non-stigmatising way, and facilitate the referral.
Take the ACE quiz. The ACE questionnaire is freely available online. It takes two minutes. Your score is not a diagnosis, not a prediction, and not a judgment. It is information — a data point that helps you understand why your nervous system might be more sensitive than someone else's. If your score is high, it doesn't mean you're damaged. It means your alarm system was calibrated in difficult conditions, and that calibration can be updated.
Reframe "Why can't I just get better?" to "My nervous system is doing what it learned to do." Self-blame is itself a DIM — a danger signal that amplifies threat and keeps the alarm running. Understanding that your pain persistence is influenced by neurobiological factors you did not choose — and could not have prevented — is a SIM. It is a safety signal. It replaces blame with understanding, and understanding shifts the nervous system toward recovery.
Notice your body's threat signals. Jaw clenching. Shoulder tension. Shallow breathing. Bracing. These are sympathetic activation — your nervous system in threat mode. When you notice them, try a slow exhale — six seconds out, through pursed lips. This activates the vagus nerve and nudges the system toward parasympathetic tone. You are not "relaxing." You are administering a neurobiological intervention that directly targets the autonomic dysregulation described in this article.
Tell yourself the truth. "My pain is real. My pain is physical. My pain is influenced by things that happened to me. Those things were not my fault. And the nervous system they shaped can be changed." This is not a mantra. This is a clinically accurate statement supported by decades of evidence. And accuracy — when it replaces blame — is medicine.
No. ACE scores represent risk, not destiny. Many people with high ACE scores do not develop chronic pain, and many people with low ACE scores do. ACE scores are one of many factors that influence nervous system sensitivity — alongside genetics, other life experiences, protective factors (supportive relationships, physical activity, resilience-building experiences), and random variation. A high ACE score means your nervous system may have a lower threshold for alarm activation — it does not determine whether that threshold will be reached.
Yes. The ACE questionnaire captures only ten specific categories of adversity, and many impactful childhood experiences fall outside its scope — bullying, medical trauma, family mental illness not captured by the questions, parental emotional unavailability, chronic illness, and other forms of developmental stress. Additionally, what constitutes "adversity" for the developing nervous system is not determined by the adult's retrospective assessment of severity. A child's nervous system can be significantly shaped by experiences that the adult minimises or does not consciously remember.
Not necessarily. Many people with adversity-influenced chronic pain recover through pain education, graded exercise, sleep improvement, social connection, and general psychological approaches (ACT, CBT, mindfulness) without ever engaging in trauma-specific therapy. Trauma therapy is indicated when specific traumatic memories are intrusive, when PTSD symptoms are present, or when the trauma response is significantly impeding engagement with other treatment. At Upwell Health Collective in Camberwell, our multidisciplinary approach integrates trauma-informed care with evidence-based physical rehabilitation. Call (03) 8849 9096 or book online.
Because adversity does not cause pain directly — it calibrates the nervous system to be more vulnerable to pain when a triggering event occurs. The injury (or illness, or stressor) that preceded your chronic pain is the triggering event. The adversity is the reason your nervous system responded to that event by developing chronic pain rather than recovering along the normal acute trajectory. Think of adversity as setting the thermostat higher: it doesn't start the fire, but when a spark occurs, the system responds with more heat, for longer, than a system with a lower thermostat setting.