Is the Fight-or-Flight Theory of Stress Incomplete?
Is the Fight-or-Flight Theory of Stress Incomplete?
by Jim Porter
For decades, stress experts have explained stress through the lens of the fight-or-flight response. The theory, first described by physiologist Walter Cannon in the early 1900s, suggests that when we perceive a threat, our bodies prepare us to either fight the danger or flee from it. Heart rate increases, muscles tense, breathing quickens, and stress hormones flood the bloodstream.
It's a powerful explanation—except for one problem.
Most of the stress people experience today has nothing to do with fighting or fleeing.
Consider the situations that cause stress for many of us: a looming work deadline, financial concerns, health worries, family conflicts, job insecurity, or uncertainty about the future. None of these situations require us to physically fight anyone or run away. Yet they can trigger the same physiological reactions that Cannon observed.
This raises an interesting question: Is stress really about fighting and fleeing, or is something else going on?
To answer that question, it helps to look at animals. Years ago, I watched an outdoor cat encounter a fox. The two animals stood just a few feet apart. For several tense moments neither moved. Eventually the fox backed away and left. The cat returned to its normal routine.
That encounter perfectly illustrates the fight-or-flight response. A genuine threat appeared, the cat assessed the situation, prepared to defend itself if necessary, and then returned to a calm state once the danger passed.
Humans are different.
If that same encounter happened to a person, there is a good chance the experience would be remembered for years. The person might tell the story repeatedly, avoid that area in the future, or imagine what could have happened if events had unfolded differently.
Unlike animals, humans possess a remarkable ability to mentally travel through time. We remember the past, anticipate the future, and replay events in our minds. We can become stressed by something that happened yesterday or by something that might happen next month.
Perhaps the real purpose of stress is broader than simply preparing us for action. Perhaps stress is a system designed to help us identify experiences that matter.
When something important happens—whether it is dangerous, exciting, rewarding, or uncertain—our attention sharpens. We become more alert. We remember details. We learn from the experience. In other words, stress may help us determine what deserves a place in memory.
Seen from this perspective, stress is not merely a survival mechanism. It is also a learning mechanism.
This idea helps explain why stressful events often become some of our strongest memories. It also helps explain why situations involving uncertainty, change, and anticipation can trigger stress even when there is no physical threat present.
Walter Cannon's fight-or-flight theory remains an important piece of the puzzle. But perhaps it is only one chapter in a much larger story. In Part Two, we'll explore how stress may function as a system for helping us remember both dangers and opportunities—and why that distinction matters in modern life.
Erica Tuminski
Author