The Full Spectrum of Trauma Responses: More than Fight or Flight

When something frightening or threatening happens, your body doesn't wait for your brain. Before you've consciously processed what's occurring, your nervous system has already launched a protective response. Most of us know this as the "fight or flight" response, and while that framing is a useful starting point, we’ve learned that it's incomplete. Research has since identified a broader set of responses, and understanding all of them can help us make sense of our own reactions.

What Happens in Your Body?

Regardless of which response gets activated, the initial physiological cascade looks similar for everyone. When the brain registers a threat, it triggers a release of adrenaline and cortisol. These are stress hormones that prepare the body for action. With that reaction, we experience physical sensations: heart rate increases, breathing shifts to shallow chest breathing, and pupils dilate to take in more of the environment. Metabolic resources get mobilized and redirected toward systems the body needs most for protection: muscles, the cardiovascular system, the sensory organs.

This is the defense cascade: a series of innate, hard-wired, automatic defenses built into all of us. As researchers Kozlowska, Walker, McLean, and Carrive describe in their 2015 review in the Harvard Review of Psychiatry, these responses aren't choices. They are neurobiological events, driven by activity in the brain, and they unfold before the prefrontal cortex (the thinking, reasoning part of the brain) can intervene.

What varies is which response gets deployed. And that, it turns out, depends significantly on what has worked before.

Why We Each Respond Differently

Not everyone fights when they feel threatened. Not everyone runs. Our nervous systems, over time, learn which protective strategy has been most effective at keeping us safe, and those patterns get reinforced and repeated. The response that helped you survive once is the one your brain reaches for first when threat arises again.

This is partly why trauma responses can become chronic patterns, rather than isolated reactions. As Kozlowska and colleagues note, humans often find themselves locked into recurring response patterns tied to the original trauma, even when the threat is long gone and the original danger is no longer present.

Understanding the five primary trauma responses – fight, flight, freeze, fawn, and flop – is a first step toward recognizing those patterns in ourselves and others.

The Five Trauma Responses

Fight

In the fight response, the brain and body kick in for active defense. The system is primed to protect through confrontation: to meet the perceived threat head-on. We often think of this as physical aggression, but it can also be verbal: raising your voice, arguing, threatening, defending, or attempting to dominate or control a situation. At its core, the fight response is the nervous system's attempt to neutralize danger by facing it directly.

Flight

In the flight response, the brain and body prepare to escape. The protective strategy here is distance: physically removing yourself from harm, or emotionally withdrawing to avoid it. This might look like literally leaving a situation. Over time, chronic activation of the flight response can develop into anxiety, panic, restlessness, or a persistent avoidance of situations that feel uncomfortable. 

Freeze

In the freeze response, the body and brain attempt to protect by going still. Think of what you might do if confronted by a bear in the woods. Rather than fighting or fleeing, the system essentially pauses, disconnecting from full engagement with the perceived threat. This can look like dissociation, appearing apathetic or unresponsive, or simply going blank. Kozlowska and colleagues describe freezing as a fight-or-flight response put on hold. It’s a temporary suspension of active defense while the nervous system reassesses. It is often misread as indifference, when in fact it is an active protective state.

Fawn

The fawn response is less about physical survival and more about relational survival. Rather than fighting or fleeing, the brain and body attempt to manage threat by becoming appealing: by pleasing, accommodating, and appeasing the source of danger. Fawning looks like people-pleasing, over-compliance, difficulty saying no, and self-erasure in the presence of others. It is a response that tends to develop in contexts where the source of threat is also the source of relationship or care (particularly in childhood) and it can become a deeply ingrained default mode that persists long into adulthood.

Flop

The flop response involves a near-total disengagement from external stimuli. The body becomes limp, the mind detaches, and the nervous system stops engaging completely with what's happening. Many researchers consider this an extended or more extreme form of the freeze response. It represents a last resort response; the system attempts to protect by withdrawing as completely as possible from an inescapable threat.

What This Means for Understanding Ourselves and Others

Recognizing these five responses can help to reframe behavior that might otherwise seem confusing, alarming, or even intentional. The student who shuts down in a difficult conversation isn't necessarily aloof or dismissive; they may be in freeze. A co-worker who agrees to everything and never pushes back isn't simply a pushover; they may be in fawn. The child who lashes out isn't misbehaving; their nervous system may be responding to a perceived threat the rest of the room isn't aware of.

These responses are not character flaws, and they’re not active choices. They are survival strategies: ones that, at some point or another, worked well enough to develop into default protective patterns. Treating them with that understanding, in ourselves and in others, is where meaningful change can begin.

Resources

Reference: Kozlowska, K., Walker, P., McLean, L., & Carrive, P. (2015). Fear and the defense cascade: Clinical implications and management. Harvard Review of Psychiatry, 23(4), 263–287. https://doi.org/10.1097/HRP.0000000000000065