If you are living with chronic illness and have never fully explored whether your history might be part of your health picture — this article is for you.

Not because chronic illness is your fault. Not because the answer to your symptoms is simply to process your feelings. But because there is a body of research — now nearly thirty years old and growing steadily — that establishes a clear, dose-dependent relationship between what happened to us, especially early in life, and what happens in our bodies later.

And because understanding that relationship may be one of the most important things you can do for your healing.

The ACEs Study — What It Found

In the 1990s, researchers Dr. Vincent Felitti at Kaiser Permanente and Dr. Robert Anda at the Centers for Disease Control and Prevention conducted one of the most significant studies in the history of medicine.

The Adverse Childhood Experiences Study — the ACEs study — surveyed over seventeen thousand adults about their childhood experiences and their adult health outcomes. The results were remarkable, and they have been replicated and extended in the decades since.

The study identified ten categories of adverse childhood experiences — including physical, emotional, and sexual abuse; physical and emotional neglect; and various forms of household dysfunction, such as growing up with a parent who had a mental illness or substance use problem, witnessing domestic violence, or experiencing parental separation or incarceration.

What the researchers found was a clear and consistent pattern: the more adverse childhood experiences a person had, the greater their risk for a wide range of health problems in adulthood.

This was not a small effect. People with four or more ACEs had up to twelve times the likelihood of attempting suicide, seven times the risk of alcoholism, and significantly elevated risk for heart disease, cancer, chronic lung disease, depression, diabetes, and early death from virtually any cause.

The relationship was dose-dependent. More ACEs meant more risk — across almost every measure of health and wellbeing.

And critically: two thirds of participants reported at least one ACE. This was not a study of extreme outliers. It was a study of ordinary people — many of them functioning well on the surface — carrying histories that were quietly shaping their health.

What the ACEs Study Didn't Measure

Here is something equally important: the ACEs study, as significant as it was, measured a specific and relatively narrow set of experiences.

It did not measure emotional neglect in subtle forms — the parent who was physically present but emotionally unavailable. It did not measure the impact of growing up with a depressed or anxious parent whose mood shaped the emotional atmosphere of the home. It did not measure chronic family stress, financial instability, bullying, medical trauma, or the experience of being a sensitive child in an environment that simply didn't have the capacity to meet your needs.

What this means is that the ACEs study almost certainly underestimates the true prevalence and impact of early life adversity.

Many people have taken an ACE quiz and scored relatively low — and concluded that trauma probably wasn't relevant to their situation. If that is you, I want to invite you to hold that conclusion lightly. Because what determines whether an experience is traumatic is not whether it appears on a standardized list. It is what the nervous system did with it.

What Trauma Actually Is

This brings us to one of the most important reframes in understanding the trauma-illness connection.

Trauma is not defined by the event. It is defined by what the nervous system experiences and stores.

Two people can go through the exact same situation. One processes it, integrates it, and moves forward. The other carries it in their body and nervous system for years or decades. The difference is not weakness. It is the state of the nervous system at the time — how much it was already carrying, how much support was available, and how equipped it was to process what happened.

This is why highly sensitive people — whose nervous systems process experiences more deeply — are often more impacted by events that others might move through more easily. And it is why the same household, the same parents, the same childhood can be experienced very differently by different children.

In the most accurate sense, trauma is any experience that overwhelms the nervous system's ability to fully process and integrate what is happening. And when that processing is incomplete, the experience is stored — with an emotional charge still attached to it — in the subconscious nervous system. Where it continues to influence the body, the emotions, the beliefs, and the behaviors — often for a very long time afterward.

Big T, Little t, and Complex Trauma

Not all trauma is the same — and understanding the distinctions matters for chronic illness.

Big T trauma refers to experiences that are obviously overwhelming — a serious accident, physical or sexual abuse, a violent event, the sudden loss of someone close, a life-threatening medical experience. These are significant, and their nervous system impact is usually substantial.

Little t trauma refers to experiences that are less dramatically obvious but that are nonetheless overwhelming to the nervous system at the time — chronic criticism from a caregiver, being bullied or socially excluded, growing up in a household marked by tension or emotional unavailability, feeling chronically unseen or misunderstood.

Little t traumas are often minimized. But they accumulate. And for sensitive nervous systems, their cumulative impact can be as significant — sometimes more significant — than a single large event.

Complex trauma refers to the cumulative impact of repeated, prolonged adversity — particularly adversity that occurred within relationships and during childhood. It doesn't produce a single traumatic memory. It produces a nervous system that was shaped, during its most critical developmental period, by chronic stress and insufficient safety. And it shows up not as flashbacks but as patterns — of relating, of self-perception, of emotional regulation, and of physical health.

Many people with chronic illness are carrying complex trauma that has never been identified, named, or addressed. Not because nothing happened — but because what happened was so woven into the fabric of daily life that it never registered as trauma at all.

The Nervous System as the Bridge

So how does trauma — in any of these forms — translate into chronic physical illness?

The bridge is the nervous system.

When a traumatic experience occurs and is not fully processed, it is stored in the nervous system with an emotional charge attached. That charge keeps the nervous system in a state of low-level activation — as if part of it is still responding to something that happened years or decades ago.

And a chronically activated nervous system has profound effects on the body.

The immune system becomes dysregulated. Inflammatory processes are chronically elevated. The autonomic nervous system — which governs heart rate, digestion, circulation, energy, and dozens of other automatic functions — loses its flexibility and stability. Sleep becomes less restorative. Pain sensitivity increases. The hormonal system drifts out of balance.

These are not psychological effects. They are physiological ones. Measurable, real, and directly traceable to the state of nervous system activation that unresolved trauma maintains.

This is why the ACEs research found what it found. Not because childhood adversity causes illness through some mysterious mechanism — but because childhood adversity, unresolved, keeps the nervous system in a state that the body was not designed to sustain indefinitely.

Hidden Trauma — What You Can't Remember

One of the most important dimensions of the trauma-illness connection is also one of the least understood: hidden trauma.

Some of the most significant material the nervous system carries is stored below the level of conscious memory. Birth trauma — the imprint of a difficult labor or early medical experience — leaves its mark on the nervous system before memory is even possible. Inherited trauma — the epigenetic transmission of stress patterns from parents, grandparents, and earlier ancestors — can show up as fears, sensitivities, and patterns of dysregulation that have no traceable origin in personal history.

And then there is the vast category of experience that simply wasn't stored as a retrievable narrative memory — either because it happened too early, because it was too overwhelming, or because the mind protected itself by keeping it below conscious awareness.

All of this is real. All of it has an impact. And — crucially — all of it can be addressed without the conscious mind ever needing to know its specific content.

Medical Trauma — A Specific and Common Dimension

For people with chronic illness, there is a particular dimension of trauma that deserves attention: medical trauma.

Chronic illness is not a single experience. It is a series of medical encounters — appointments, tests, procedures, diagnoses, treatments — each of which leaves some kind of imprint on the nervous system. The years of unexplained symptoms before a diagnosis. The diagnosis itself, which often arrives as a shock. The treatments that didn't work. The interactions with providers who didn't listen or didn't believe.

All of this accumulates. And it is compounded by vicarious experience — what happened to family members, what was witnessed in loved ones — and by absorbed stories about illness, treatment, and what medicine does and doesn't offer.

The result is a nervous system that approaches medical situations not with neutrality but with a full freight of stored experience that shapes every new encounter before it has even begun.

Medical trauma is extraordinarily common in people with chronic illness. And it is almost never addressed.

What Neural Retraining Offers

Neural retraining works directly with the subconscious nervous system patterns that unresolved trauma creates and maintains.

Not through reliving traumatic experiences. Not through talking extensively about what happened. Not through analysis or insight alone — though understanding has its place.

Instead, in a gentle meditative state — not hypnosis, not trance, but a relaxed and aware focus that allows the subconscious mind to become accessible — the stored charges associated with traumatic experiences are identified and dissolved.

The person doesn't need to know what the patterns are, or where they came from. They only need to know what the issues are in their current life. The subconscious takes it from there.

As those charges dissolve, the nervous system's baseline activation shifts. The chronic background stress response quiets. The immune system has more resources for regulation. Sleep deepens. Energy becomes more available. Pain sensitivity reduces.

And the body — which has been reflecting the nervous system's dysregulation — begins to respond.

Neural retraining builds on what earlier approaches like EMDR and tapping established — that trauma healing requires working below the level of conscious thought, with the subconscious nervous system directly. But it goes further, working with the full range of stored material: direct personal trauma, witnessed and absorbed experiences, complex developmental patterns, and hidden material that conscious memory cannot access.

The goal is not symptom management. It is not a more functional version of the same burdened self. It is the dissolving of what trauma stored — so that the nervous system can finally do what it has always been trying to do.

Heal.

Is This Work Right for You?

If you are living with chronic illness and something in this article has resonated — if you find yourself wondering whether your history might be part of your health picture — I want to encourage you to explore that further.

Not because you need to have it all figured out. Not because you need to know exactly what you're carrying or where it came from. But because the nervous system that learned to carry this can learn something different.

To take the next step:

• Visit TCNeuralRetraining.com to learn more about the work
• Take our free quiz to find out whether neural retraining may be a good fit for you
• Schedule a free phone consultation to talk through your situation

Your history does not have to write your future. And the healing that has felt just out of reach may be closer than you think.

Listen to the Full Series

This article is a companion to the Trauma, the Nervous System, and Chronic Illness podcast series:

• Episode 128: What Trauma Really Is — and Why It May Be at the Root of Your Chronic Illness
• Episode 129: When Fear Lives in the Body — Trauma, Chronic Pain, and the Nervous System
• Episode 130: The Trauma You Don't Know You're Carrying — and How to Heal It
• Episode 131: Healing Complex Trauma — How Chronic Adversity Shapes the Nervous System and the Body
• Episode 132: The Trauma of Witnessing — Caregivers, Empaths, and the Cost of Being the Strong One
• Episode 133: From Needle Phobia to Surgery Prep — Resolving Medical Trauma with Neural Retraining
• Episode 134: Trauma and the Stories We Tell About Ourselves — Core Beliefs, the Inner Critic, and Chronic Illness
• Episode 135: Hyperindependence, Perfectionism, and Self-Sabotage — How Trauma Drives Behavior
• Episode 136: The Loss of Self – How Trauma Creates Disconnection and What Restores It
• Episode 137: Beyond EMDR and Tapping — Why Neural Retraining Is the Next Generation of Trauma Healing

Search for the Retrain the Brain for Chronic Illness podcast wherever you listen to podcasts.

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Madeleine Lowry is a neural retraining specialist and the founder of Twin Cities Neural Retraining. She works with people of all ages to improve their emotional, mental, behavioral and physical health in virtual sessions over Zoom. She helps people with chronic illness and symptoms to resolve the subconscious blocks that keep the nervous system dysregulated and the body stuck. Learn more at TCNeuralRetraining.com.