How Childhood Experiences Shape Health for a Lifetime

Early Experiences, Lifelong Effects

Imagine being able to identify someone’s risk for heart disease, diabetes and other chronic illnesses decades before symptoms appear, not through a blood test or genetic screening, but by understanding the experiences they’ve lived through.

It sounds a little like science fiction, but decades of research have shown that childhood experiences can shape lifelong health in profound ways.

Researchers call these experiences Adverse Childhood Experiences, or ACEs. While many people think of childhood trauma as something that primarily affects mental health, the research tells a much bigger story.

“We’re talking about health in its totality,” said Chris Eggleston, MD, medical director of Northern California, Central Valley, Inland Empire regions & LynCentro division. “That includes diabetes, heart disease, high blood pressure, autoimmune disease. We know that childhood trauma or adversity is associated with significantly increased physical health morbidity and a shortening of the lifespan.”

What Are ACEs?

ACEs are potentially traumatic experiences that occur before age 18. They include experiences such as abuse, neglect, witnessing domestic violence, living with a caregiver who struggles with mental illness or substance use, or having a household member who is incarcerated.

Researchers developed the ACE framework to better understand how these experiences affect people over time. What they discovered was remarkable: as adverse childhood experiences accumulate, so does the risk of both mental and physical health challenges later in life.

Risk Isn’t Destiny

It’s also important to understand what ACEs scores don’t measure.

ACEs help us understand risk, but risk is not the same thing as destiny.

“ACEs are a valuable tool for understanding a person’s history and are not a measure of their future. An ACE score is a starting point to help us understand exposure to adversity,” said Lacey Castellese, executive director of education/emerging statewide services. “At the same time, we know that protective factors such as having safe, stable relationships, positive school environments and connectedness are opportunities to build resilience and can significantly change a child’s trajectory.”

At Pacific Clinics, clinicians use an understanding of ACEs to help see the whole person, not simply the symptoms or behaviors that brought someone to their office. Recognizing how adversity may be affecting someone today can help identify where additional support is needed, while protective factors and strengths can point toward opportunities to build resilience. Every person’s story is more complex than a number.

Why Childhood Experiences Affect Adult Health

Our bodies are designed to respond to danger.

Imagine you’re an early human foraging in a meadow when you suddenly spot a hungry-looking saber-toothed tiger a few yards away. Your heart races. Your breathing changes. Stress hormones surge through your body, preparing you to fight or flee. It’s actually a pretty incredible survival system, and none of us would be here today if it hadn’t worked for our ancestors for millions of years.

The problem is that this response was never meant to stay switched on.

“When there is a potential threat, we need to be in a fight-or-flight state to maximize our chances of survival,” Chris explained.

In a healthy situation, once the danger has passed, the body settles back into a state of calm. But for children growing up in unpredictable or unsafe environments, that sense of safety may never fully arrive. Over time, chronic stress can take a toll on developing bodies and brains, contributing to health challenges that may not appear until years or even decades later.

Understanding the Whole Person

For many adults, learning about ACEs can be validating.

It offers a new way of understanding connections that may not have seemed obvious before: why stress feels overwhelming, why certain situations trigger intense reactions or why mental and physical health are often deeply intertwined.

“A lot of that ties into understanding the nature of the symptoms and the physical health challenges of a person,” Chris said. “Oftentimes those symptoms have meaning.”

That shift in perspective is central to trauma-informed care at Pacific Clinics. Rather than asking only “What’s wrong with this person today?” providers increasingly ask “What happened to this person?” Understanding someone’s experiences doesn’t erase their challenges, but it can provide important context that leads to more compassionate, effective care.

Healing Is Possible

One of the most hopeful lessons from ACEs research is that childhood experiences can ripple into the present, but they are not the end of the story.

While early intervention can help change a child’s developmental trajectory, healing isn’t limited to childhood. Positive relationships, effective behavioral health treatment and supportive communities can help people build resilience throughout their lives.

California has become a national leader in trauma-informed care through initiatives like ACEs Aware, which equips health care providers to better recognize and respond to the lifelong effects of childhood adversity. At Pacific Clinics, that understanding translates into care that looks beyond immediate symptoms to consider the experiences, relationships and environments that shape a person’s well-being.

“We tailor interventions that address the root causes rather than just the symptoms,” Lacey said. “Thanks to our dedicated school-based teams, for example, we have the privilege of witnessing students heal and thrive.”

Whether we’re supporting a child, an adult or an entire family, our goal is the same: to understand each person’s experiences, help them build on their strengths and provide the tools they need to move toward a healthier future.

Childhood trauma may leave lasting effects, but it doesn’t have to define the rest of someone’s life. With understanding, support and the right care, healing is always possible.