There is a common assumption that children are resilient, that they will “bounce back” from difficult experiences and eventually leave them behind. While children do have remarkable capacity for adaptation, the research paints a more complicated picture. Childhood trauma does not simply disappear with time. It reshapes the brain, the body, and the way a person moves through the world, often in ways they do not recognise until decades later.
If you grew up in a home where things were unpredictable, unsafe, or emotionally overwhelming, you may be carrying the effects of those experiences in ways that feel confusing. Chronic anxiety with no obvious cause. Difficulty trusting people, even the ones who love you. A body that seems to be permanently on alert. Relationships that follow the same painful patterns over and over again.
Understanding how childhood trauma works is the first step toward doing something about it.
The ACE Study: A Turning Point in Understanding
In 1998, Dr. Vincent Felitti of Kaiser Permanente and Dr. Robert Anda of the Centers for Disease Control and Prevention published the Adverse Childhood Experiences (ACE) Study. It has since become one of the most cited and influential pieces of public health research ever conducted.
The study surveyed over 17,000 adults about ten categories of adverse childhood experiences: physical, emotional, and sexual abuse; physical and emotional neglect; and household dysfunction including parental substance abuse, mental illness, domestic violence, divorce, and incarceration of a family member.
The findings were striking. First, adverse childhood experiences were far more common than anyone had expected. Nearly two thirds of participants reported at least one ACE. More than one in five reported three or more. And this was not a marginalised population. These were largely white, middle-class, college-educated adults with good health insurance (Felitti et al., 1998).
Second, and more importantly, the study revealed a powerful dose-response relationship: the more categories of adverse experiences a person reported, the higher their risk of serious health problems in adulthood. Adults with four or more ACEs showed dramatically elevated rates of depression, substance abuse, heart disease, cancer, chronic lung disease, and suicide attempts compared to those with no ACEs (Felitti et al., 1998).
How Trauma Gets Under the Skin
The ACE Study showed the what. Subsequent research has shed light on the how. The connection between childhood adversity and adult health problems is not simply behavioural (although trauma does increase the likelihood of unhealthy coping strategies like smoking, substance use, and overeating). The connection is also biological.
When a child lives in a state of chronic stress, their developing brain adapts to survive in a threatening environment. The stress response system, governed by the hypothalamic-pituitary-adrenal (HPA) axis, becomes overactive. Cortisol, the body’s primary stress hormone, floods the system repeatedly, and over time this can lead to lasting changes in brain structure and function.
The amygdala, the brain’s threat detection centre, can become enlarged and hyperreactive, meaning the person grows up with a nervous system that is perpetually scanning for danger. The prefrontal cortex, responsible for rational thought, emotional regulation, and impulse control, can develop more slowly or function less efficiently. The hippocampus, which processes memory and distinguishes past events from present ones, can also be affected, which helps explain why trauma survivors sometimes experience flashbacks or have difficulty distinguishing old threats from current safety (Anda et al., 2006).
What It Looks Like in Everyday Life
Adults who experienced childhood trauma often do not identify it as trauma at the time. It was just their life. But the effects show up in patterns that can be deeply confusing if you do not understand where they come from.
- Hypervigilance: always scanning for what might go wrong, difficulty relaxing, being startled easily, sleep problems.
- Difficulty with relationships: struggling to trust, pushing people away when they get close, choosing partners who repeat familiar but unhealthy dynamics.
- Emotional dysregulation: intense emotional reactions that feel disproportionate to the situation, or conversely, feeling numb and disconnected.
- Chronic self-criticism: a deep sense of unworthiness, feeling fundamentally flawed, difficulty accepting praise or kindness.
- Physical health problems: unexplained chronic pain, digestive issues, autoimmune conditions, and cardiovascular problems.
- Difficulty making decisions: a pervasive sense of being stuck, fear of making the wrong choice, or feeling paralysed by options.
These are not character flaws. They are the logical outcomes of a nervous system that was shaped by adversity. And because they are learned responses, they can be unlearned.
The Good News: the Brain Can Change
The same neuroplasticity that allowed your brain to adapt to a stressful childhood also means it can adapt to safety, connection, and healing. This is where therapy comes in.
Evidence-based treatments like Cognitive Processing Therapy (CPT) are specifically designed to address the thought patterns and beliefs that trauma leaves behind. CPT helps you identify the “stuck points”, the beliefs like “it was my fault,” “I cannot trust anyone,” or “the world is fundamentally unsafe”, that your brain formed in response to your experiences but that are no longer serving you (Resick, Monson & Chard, 2017).
Through structured therapeutic work, these beliefs can be examined, challenged, and replaced with more accurate and compassionate ways of seeing yourself and the world. Research consistently shows that CPT significantly reduces PTSD symptoms in the majority of people who complete the 12-session protocol, and that these improvements tend to last.
Mindfulness-based approaches also play an important role in trauma recovery. By learning to stay present and observe your thoughts and sensations without being overwhelmed by them, you begin to build a new relationship with your own internal experience, one based on curiosity rather than fear.
It Is Not Too Late
One of the most important messages of the ACE research is that awareness itself is powerful. Understanding the connection between your childhood experiences and your current struggles is not about blame. It is about making sense of patterns that may have felt mysterious or shameful for years. And it is about recognising that you have options now that you did not have as a child.
At Wholeness Therapy Group in King City, Oregon, I work with adults who are beginning to make these connections. Whether you have always known your childhood was difficult or you are only now starting to see the patterns, therapy can help you understand what happened, how it shaped you, and how to move forward.
If any of this resonates, I would be honoured to talk with you. You can reach me at 503-495-5072 or through the contact form on this site.
