Fight or Flight Response: What Triggers It and How to Calm Your Body Down
The fight or flight response prepares your body to react to a perceived threat. This free printable explains common sensations and practical ways to respond when the alarm feels too strong.
Reviewed by Michael Callans, MSW 
About this tool
The fight or flight response is your body's automatic preparation to confront or escape a perceived threat. This free printable explains why a racing heart, tense muscles, and faster breathing can appear during danger or ordinary stress, and offers ways to respond to those sensations. First described by physiologist Walter Cannon in the early twentieth century, it involves communication between the brain, autonomic nervous system, and adrenal glands. Adrenaline helps mobilize the body quickly, while a related hormonal pathway involving cortisol can sustain the stress response.
The physical changes are dramatic and happen without your permission. Your heart rate and blood pressure climb to push oxygen-rich blood to large muscles. Breathing speeds up. Blood is diverted away from the gut and skin and toward the limbs, which is why you may feel nauseous, get cold hands, or notice your stomach drop. Pupils widen, senses sharpen, and non-urgent processes like digestion slow down. This is brilliant when you face a genuine physical emergency.
The same alarm can fire for modern, non-physical threats: a work email, a difficult conversation, an intrusive thought, or a memory. Your brain can recognize a deadline as different from physical danger while still initiating a strong bodily stress response. That activation may feel like anxiety, racing thoughts, irritability, or restlessness. Recognizing a familiar stress pattern may help you make sense of it. These sensations alone cannot establish their cause, however, and new or unusual symptoms deserve medical attention rather than an automatic assumption that they are anxiety.
You can try to support recovery by using relaxation practices that involve the parasympathetic nervous system, which helps the body settle after a threat passes. Comfortable slower breathing, grounding through the senses, gentle movement, and reassuring self-talk are options to explore. They do not provide an immediate off switch, and their usefulness varies with the situation and the person. If you are still in danger, getting to safety takes priority over completing a calming exercise.
Fight and flight are the two most familiar responses, but researchers describe a wider spectrum. Psychiatrist H. Stefan Bracha proposed a freeze, flight, fight, fright, faint sequence, in which the body often freezes first, scanning for the safest option, before moving into flight or fight if the threat continues. A fourth pattern sometimes discussed alongside these is fawning, appeasing or people-pleasing a threat to defuse it, which some clinicians treat as a learned survival strategy rather than a separate automatic reflex. None of these responses is a character flaw. They are different strategies the same alarm system reaches for depending on the situation.
When the alarm fires occasionally, the body recovers fully between episodes. Repeated or constant activation is different. Neuroscientist Bruce McEwen described this cumulative wear as allostatic load, the biological cost of a stress system that rarely gets to switch off, which has been linked to elevated blood pressure, disrupted sleep, and a weakened immune response over time. This is part of why learning to actively calm the response, rather than just enduring it, matters beyond the moment it happens.
If the alarm is going off several times a day, disrupting sleep or work, or showing up as panic attacks, that is worth bringing to a professional rather than managing alone indefinitely. A therapist can help identify what is triggering it so often and build longer-term regulation skills. You can search the Psychology.com therapist directory to find one.
Use this explainer as a reference for a conversation, rather than as a symptom checklist that produces a diagnosis. After an episode, you might write down what was happening, what you noticed, and what helped you return to your activity. The useful output is a description of your experience that you can share with a clinician. You do not need to keep checking your pulse or wait for every sensation to disappear before deciding what support you need.
Grounding Techniques offers a way to focus on your surroundings if paying close attention to breathing feels uncomfortable. Box Breathing is another optional practice, but follow a comfortable pace and stop if it increases discomfort. The Panic Disorder Test is a screening option for recurring panic concerns; it cannot determine whether physical symptoms have a medical cause. The tools hub provides other exercises you can choose according to the situation.
Harvard Medical School's explanation of the stress response describes research on relaxation practices and their possible role in managing stress-related physical changes. That evidence supports considering these practices as coping options; it does not establish that this printable treats panic disorder or guarantees recovery. NIMH advises assessment for panic symptoms, including checking for unrelated physical causes. Seek urgent medical help for severe or unfamiliar chest pain, significant breathing difficulty, or symptoms that seem like a medical emergency.
References
- Cannon WB. Bodily Changes in Pain, Hunger, Fear and Rage. New York: D. Appleton & Company; 1915.
- McEwen BS. Physiology and neurobiology of stress and adaptation: central role of the brain. Physiol Rev. 2007;87(3):873-904.
- Harvard Health Publishing. Understanding the stress response. Harvard Medical School; 2020.
- Bracha HS. Freeze, flight, fight, fright, faint: adaptationist perspectives on the acute stress response spectrum. CNS Spectr. 2004;9(9):679-685.
- McEwen BS. Allostasis and allostatic load: implications for neuropsychopharmacology. Neuropsychopharmacology. 2000;22(2):108-124.
- Harvard Health Publishing. Understanding the stress response. Harvard Medical School. April 3, 2024. https://www.health.harvard.edu/healthy-aging-and-longevity/understanding-the-stress-response
- National Institute of Mental Health. Panic Disorder: What You Need to Know. https://www.nimh.nih.gov/health/publications/panic-disorder-when-fear-overwhelms
Cite this source
Psychology.com. (2026, September 16). Fight or Flight Response. Psychology.com. https://psychology.com/tools/fight-or-flight
Fight or Flight Response FAQ
What is the fight-or-flight response?
The fight or flight response is your nervous system's automatic preparation to confront or escape a perceived threat. Sympathetic activation and stress hormones change heart rate, breathing, and muscle readiness. This can happen during physical danger or stressful thoughts. The response itself is protective, although its sensations can feel frightening.
Why do I feel it when there is no real danger?
Thoughts, memories, uncertainty, and social stress can trigger the body's threat response even when there is no immediate physical danger. Recognizing that you are safe does not always make the sensations settle immediately. Look at the situation as well as the sensations, and seek assessment if episodes recur or symptoms are unfamiliar.
How do I turn off fight or flight?
Once you are safe, try comfortable slower breathing, noticing your surroundings, or gentle movement. Choose an approach that feels manageable and allow the sensations to settle without demanding instant relief. There is no guaranteed off switch. Severe or unfamiliar physical symptoms need medical attention, especially when you are unsure of their cause.
Is the fight-or-flight response harmful?
In short bursts it is protective and normal. Problems arise when it fires too often or stays on too long, which can contribute to chronic stress and anxiety. If that sounds like you, a professional can help. Recurring symptoms also deserve an assessment because a worksheet cannot distinguish stress from a physical health condition.
What is the freeze response?
Freeze is a defensive stress reaction, alongside fight and flight, in which the body pauses and scans for the safest option before acting. Researchers describe a freeze, flight, fight, fright, faint spectrum, with freeze often coming first as the nervous system decides what to do next.
What is the fawn response?
Fawning is responding to a threat by appeasing or pleasing the other person to reduce danger, rather than fighting or fleeing it. Some clinicians view it as a learned survival pattern, often shaped by earlier experiences, rather than a separate automatic reflex like fight, flight, or freeze.