Trauma and the Nervous System: How Chronic Stress Shapes the Body and How Somatic Therapy Supports Healing

Trauma—especially when experienced early in life or over long periods—can shape our lives in profound ways. It influences how we think, feel, and relate to others. But trauma does not only affect the mind. It also leaves lasting imprints in the body.

Many people carry the effects of childhood adversity, relational wounds, emotional neglect, or prolonged stress. Even when we do not consciously remember specific events, the nervous system may still be responding to the conditions in which it learned to survive.

This can help explain why some people experience anxiety, overwhelm, or physical symptoms that seem to arise without a clear cause.

Understanding how trauma and chronic stress affect the body allows us to approach these experiences with more clarity and compassion.

How Trauma and Chronic Stress Affect the Nervous System

When we encounter threat or distress, the body’s survival systems activate. The nervous system stress response shifts the body into states commonly described as fight, flight, or freeze.

Heart rate increases. Breathing changes. Muscles prepare for action. Attention narrows toward potential danger.

In the moment, these responses are adaptive. They help us respond quickly to protect ourselves. However, when stress is prolonged—or when trauma occurs during early development—the nervous system may have difficulty returning to a more settled baseline.

Instead, the body may remain organized around signals of threat even when the original danger is no longer present.

When Stress Becomes Chronic in the Body

In situations such as emotional neglect, abuse, or unpredictable caregiving, the nervous system may gradually learn that the world is unsafe.

Even when life circumstances change, internal stress responses may remain active.

This chronic stress physiology can lead people to feel as if they are constantly “on alert” or “overridden.”

Over time, this may appear as:

• heightened anxiety or hypervigilance

• chronic muscle tension and shallow breathing

• sleep or digestive disturbances

• a persistent sense of unsafety or emotional numbness

  
  

Trauma is not only something that happened in the past. It can remain active in muscle tone, breathing patterns, posture, and nervous system regulation.

Without addressing these bodily patterns, symptoms may persist despite insight or effort.

The Connection Between Trauma and Physical Health

Many people living with unresolved trauma also experience physical symptoms that do not always have a clear medical explanation.

These can include:

• chronic fatigue

• headaches or migraines

• digestive issues such as IBS or reflux

• autoimmune flare-ups

• heart palpitations or cardiovascular symptoms

  
  

These symptoms are not imagined.

While trauma is rarely the sole cause of illness, chronic stress affects multiple systems in the body, including hormone regulation, immune function, and inflammation. When the nervous system remains organized around survival, the body directs energy toward protection rather than restoration.

A body under threat is not focused on healing—it is focused on surviving. Recognizing this connection can shift how we understand symptoms that otherwise feel confusing or discouraging.

Living in Survival Mode

When the nervous system remains in a trauma-activated state, everyday life can feel unexpectedly difficult.

People may notice experiences such as:

• always bracing for something bad to happen

• feeling “on edge” even in relatively safe situations

• difficulty concentrating or staying present

• emotional shutdown or sudden overwhelm

• feeling disconnected from the body or from others

These patterns often affect relationships, work life, and overall well-being.

Importantly, they are not personal flaws. They are adaptive responses that once helped the nervous system navigate overwhelming circumstances.

Healing begins when we recognize these patterns as survival strategies, rather than signs that something is wrong with us.

How Somatic Therapy Supports Nervous System Healing

While insight and coping tools can be helpful, trauma often lives in the body as well as the mind.

Somatic therapy is a body-oriented approach that helps the nervous system gradually shift from survival patterns toward greater regulation and safety.

Rather than focusing only on thoughts or memories, somatic therapy works with the body’s internal signals—sensations, breath, posture, impulses, and movement. These bodily experiences often hold both the imprint of past stress and the pathway toward healing.

In my work as a somatic therapist, I often see this shift unfold slowly. Clients move from chronic tension toward moments of settling, from constant activation toward a quieter sense of presence.

One client recently described noticing—for the first time—that their body could settle internally rather than feeling as if adrenaline were constantly running through it.

These moments may appear small, but they are meaningful signs that the nervous system is beginning to reorganize.

What Somatic Therapy Helps People Develop

Somatic therapy often helps clients:

• recognize fight, flight, freeze, or fawn states

• track sensations without becoming overwhelmed

• unwind chronic muscular holding patterns

• develop a greater sense of internal safety

• reconnect with the body’s natural rhythms of rest and engagement

The goal is not to force the body to change. Instead, somatic therapy creates conditions where the nervous system can remember how to regulate itself.

Tools That Support Nervous System Regulation

Somatic work may include simple practices that gradually support regulation.

Examples include:

• grounding practices such as feeling contact with the floor or chair

• slow, steady breathing to support parasympathetic activation

• gentle movement or trauma-sensitive yoga•

• omatic tracking of body sensations

• supportive self-touch such as placing a hand on the chest

  
  

Research in neuroscience and trauma psychology suggests that these practices help expand what clinicians call the window of tolerance—the range of emotional and physiological states the nervous system can experience without becoming overwhelmed.

From Survival Toward Regulation

Trauma shapes how we move through the world, but it does not have to define us. When we understand that trauma affects the nervous system and body, we often stop blaming ourselves for feeling anxious, shut down, or disconnected.

These experiences are not signs of weakness. They are signs that the nervous system has been trying to protect us.

Somatic therapy invites a different approach to healing—one based less on effort and more on listening to the body with curiosity and care.

Over time, the nervous system can begin to rediscover a sense of safety.

Healing does not happen by forcing the body to change. It happens as the body gradually remembers how to settle.

Your body is not the problem.

It is often the pathway toward healing.

Jane Kwok-Yee Leung, LMFT, SEP is specializing in somatic therapy for trauma and chronic stress.