The Stress Response: Fight, Flight or Freeze
An explainer on how the body's threat system works, why the physical feelings of fear are uncomfortable but harmless, and why false alarms happen.
Written by Tarun Vermani, Trainee Clinical Psychologist Last reviewed
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The Stress Response: Fight, Flight or Freeze
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Your body has a built-in alarm system
Deep in your brain sits a small alarm called the amygdala. Its job is to keep you safe. When it senses danger it sets off an instant response before you have even had time to think. This is called the fight, flight or freeze response, and every human being has it.
Fight, flight or freeze
The alarm prepares your body to act. Fight means getting ready to face the danger. Flight means getting ready to run from it. Freeze means going still and quiet, the way an animal does to avoid being noticed. You do not choose which one happens. Your body picks for you in a split second.
Why your body feels the way it does
To get you ready to fight or run, your body floods with adrenaline. Your heart speeds up to push blood to your muscles. You breathe faster to take in more oxygen. Your muscles tense, your senses sharpen, and blood moves away from your stomach. Every one of these changes has a purpose: it is your body protecting you, not breaking down.
Which of these do you notice?
These are the most common physical feelings the alarm creates. They can be strong and unpleasant, but each one is a normal part of the response. Tick the ones you recognise in yourself.
Uncomfortable, but not dangerous
These feelings can be frightening, especially when they come on strongly. But the response is designed to protect you, and your body is built to handle it. The sensations are not a sign that something is physically wrong or that you are about to collapse. Once the alarm switches off, the feelings settle on their own. They always pass. If you have not already done so, it is worth getting these sensations checked by your GP so you know they are safe. Once that is done, this handout is about learning that the feelings, although unpleasant, are not harmful.
When the alarm is a false alarm
The alarm is not perfect. Sometimes it goes off when there is no real danger, like a smoke alarm triggered by burnt toast. This is called a false alarm. The response still feels completely real, but there is nothing to fight or flee from. Learning to recognise a false alarm, and to let the feelings rise and fall without fighting them, is a skill that gets easier with practice.
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When to use The Stress Response: Fight, Flight or Freeze
The Stress Response: Fight, Flight or Freeze is an interactive cognitive behavioural therapy (CBT) worksheet, most often used in CBT for panic.
It is designed to be used within therapy rather than as a standalone self-help tool: a therapist introduces it, works through it collaboratively, and helps make sense of what it surfaces. You can preview the full worksheet above, then assign it digitally for clients to complete between sessions on any device — or download it as a print-ready PDF.
How it works
Most people work through it in around 7 minutes. It moves through six short steps:
- Your body has a built-in alarm system — Deep in your brain sits a small alarm called the amygdala. Its job is to keep you safe. When it senses danger it sets off an instant…
- Fight, flight or freeze — The alarm prepares your body to act. Fight means getting ready to face the danger. Flight means getting ready to run from it. Freeze means…
- Why your body feels the way it does — To get you ready to fight or run, your body floods with adrenaline. Your heart speeds up to push blood to your muscles. You breathe faster…
- Which of these do you notice? — These are the most common physical feelings the alarm creates. They can be strong and unpleasant, but each one is a normal part of the…
- Uncomfortable, but not dangerous — These feelings can be frightening, especially when they come on strongly. But the response is designed to protect you, and your body is…
- When the alarm is a false alarm — The alarm is not perfect. Sometimes it goes off when there is no real danger, like a smoke alarm triggered by burnt toast. This is called a…
Completed on the Formulate platform, your client's answers are saved automatically and shared straight back to you, so you can review them before the next session rather than waiting for a paper copy to come back.
The CBT approach behind it
In common with other CBT methods, The Stress Response: Fight, Flight or Freeze works by noticing the links between situations, thoughts, feelings, physical sensations and behaviour — and finding practical ways to change unhelpful patterns. The aim is not positive thinking but a clearer, shared understanding of what keeps a difficulty going — and practical, testable ways to change it.
Because it is a CBT tool it stays focused on the here-and-now links between thoughts, feelings, the body and behaviour, and it works best as one part of a wider course of therapy rather than as advice or a diagnosis.
Evidence & sources
This worksheet is grounded in established cognitive behavioural therapy theory and practice. Key sources include:
- Cannon, W.B. (1915). Bodily Changes in Pain, Hunger, Fear and Rage. New York: D. Appleton.
- Clark, D.A. & Beck, A.T. (2010). Cognitive Therapy of Anxiety Disorders: Science and Practice. New York: Guilford Press.
For use alongside professional support
Formulate provides educational CBT resources for use with a qualified therapist. They are not a substitute for professional assessment, diagnosis, or crisis care.
If you need urgent help now:
- Emergency services: 999 — if you or someone else is in immediate danger
- Samaritans: 116 123 — free, day or night, 365 days a year
- SANEline: 0800 689 5555 — 4:30pm–10:30pm, every day
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