What Is Trauma?

Trauma is not about what happened — it's about what happened inside you when it did.

The word "trauma" is used everywhere now, but its meaning is often misunderstood — either narrowed to only the most dramatic experiences (war, assault, serious accidents) or expanded so broadly as to lose meaning altogether. Understanding what trauma actually is — not as a label or a category, but as an experience of the nervous system — changes the way you see yourself and others.

The Most Important Thing to Know About Trauma

Trauma is not defined by what happened. It is defined by what happened inside you when it did. Two people can experience the same event and one will be traumatised and the other will not — because trauma is determined not by the event itself but by the nervous system's response to it and its capacity to process and recover from that response.

This means that there is no hierarchy of "real" trauma. There is no threshold of suffering you must have crossed to deserve support. If your nervous system was overwhelmed — if you were left in a state of unresolved activation that continues to affect your functioning — that is trauma, regardless of how the event compares to what others have experienced.

What Trauma Does to the Nervous System

When we encounter something overwhelming — something that threatens our safety, our sense of control, or our sense of the world as fundamentally manageable — the nervous system activates an emergency response. Heart rate increases, stress hormones flood the bloodstream, the thinking brain goes offline and the survival brain takes over. This is extraordinarily well designed for genuine short-term threat.

Trauma occurs when this response is not fully completed — when the experience is too overwhelming, when circumstances prevent completion, or when there is no safe relational context in which to process what happened. The nervous system gets stuck, maintaining a degree of activation that was appropriate to the emergency but that persists, unhelpfully, long after the emergency has passed.

"Trauma is not what happens to us, but what we hold inside in the absence of an empathetic witness." — Peter Levine, developer of Somatic Experiencing

Types of Trauma

What most people think of when they think of trauma: single-incident, severe events such as assault, serious accidents, natural disasters, combat, or witnessing violence. These events are clearly overwhelming by most people's standards, and their potential to produce PTSD-style responses is well documented.

Experiences that may seem less dramatic but are nonetheless overwhelmingly impactful to the nervous system at the time of occurrence: persistent emotional neglect, chronic criticism, bullying, relationship betrayal, emotional abuse, growing up with a depressed or addicted parent. Small-t traumas are often more significant in their long-term impact than big-T traumas because they tend to be chronic, relational, and occurring in developmental periods.

Trauma that occurs repeatedly within attachment relationships, particularly in childhood. The combination of repeated exposure and the involvement of primary caregivers creates a particularly deep impact on the developing personality, nervous system and attachment patterns.

You Are Not Broken

Perhaps the most important thing to say about trauma: experiencing it does not mean something is wrong with you. Your responses — however confusing or disruptive — make sense. They are the normal responses of a human nervous system to abnormal circumstances. Understanding them in that light is the beginning of being able to change them.

Take our free 3-minute quiz to understand how your nervous system responds to stress — and what it means for your relationships.

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This site is for informational purposes only and is not a substitute for professional mental health advice.