What is Trauma and the Window of Tolerance?

As awareness of mental health grows, the word trauma has become part of everyday vocabulary. But what does it actually mean? Put simply, trauma is the physical and emotional response to an event, or events, that overwhelmed your natural ability to cope.

Trauma is also a very individual experience. What is and isn't traumatic depends on how you experienced the event, not the event itself. For example, two people could be in the same car accident. One might feel okay after a few days, while the other starts to have post-trauma symptoms.

This doesn't mean one person is stronger than the other. They simply have different nervous systems that react and adapt differently, based on their physiology and history. In another situation, their responses might be the opposite. People are wired differently, and it is not a fault or shortcoming of yours if you have experienced trauma and struggle with its effects.

How does trauma show up?

When you think about signs of trauma, you might picture common media images, like a war veteran having flashbacks during fireworks, or an assault survivor flinching at a touch.

These experiences do happen for real trauma survivors. But just as trauma is an individual experience, its signs differ from one person to another.

Here are some common responses to trauma:

Dissociation: You may feel detached from yourself, your surroundings, or the present moment, and things may feel unreal or dreamlike. People often describe this as feeling spaced out, on autopilot, or zoned out.

Emotional numbness: You may feel empty inside or unable to feel emotions. You might not respond to things that make other people sad or angry.

Intense emotions: Your emotions may feel too strong. Something that would usually make you a bit irritated might make you intensely angry, and you may have outbursts of feeling that seem to come out of nowhere.

Hypervigilance: You may feel always on edge or anxious, or expect something bad to happen. You may startle easily at loud noises or voices.

Impact on relationships: You may notice yourself withdrawing, pushing people away, or getting into conflicts. Or, on the other end, you may find yourself seeking and relying on others for support much more than usual.

Risk-taking behaviours: You may find yourself doing high-risk things, like using substances heavily to avoid pain, driving recklessly, or having unsafe sex.

Physical symptoms: You may have a racing heart, sweating, unexplained pain, fatigue, loss of appetite, or sleep difficulties, like trouble falling asleep, staying asleep, or sleeping too much.

Flashbacks and nightmares: You may have vivid memories of the trauma, or feel like you are living through it again, through nightmares or intrusive thoughts, emotions, images, sounds, or other sensations.

Trauma responses and the window of tolerance

There is a lot of research on why trauma causes these responses, and one helpful way to understand it is the window of tolerance.

First described by psychiatrist Dr. Dan Siegel, the window of tolerance is the idea that everyone has an optimal zone of arousal where they can function and process their experiences in a calm, steady way.

Inside your window, you feel focused and connected to the present moment, to yourself, and to others, and you can manage stress and difficulties. This doesn't mean you are never upset or stressed. It means you can cope without becoming overwhelmed.

Difficult or intense events, like trauma, can push you outside this window and into automatic survival states called hyperarousal and hypoarousal. Trauma can also change the size of your window.

What is hyperarousal?

Hyperarousal is a state of high nervous system activation, commonly known as the fight, flight, or freeze response.

In this state, you may feel fear, anxiety, anger, overwhelm, panic, or hypervigilance. You may notice physical signs like a racing heart, shortness of breath, tight muscles, or being unable to move.

You might have anger outbursts you didn't intend, become aggressive or short-tempered, want to avoid or escape, or fawn, going along with what someone else wants out of fear and anxiety.

What is hypoarousal?

Hypoarousal is a state of low nervous system activation, also known as a collapse or shutdown response.

Freezing can happen in this state too. You often feel numb and low in energy, and you may dissociate, feeling detached from yourself, others, or the world. Physically, it can feel like you can't move your muscles or even speak, as if all your strength has drained away. You may withdraw from people and the world around you.

What are automatic responses?

Hyperarousal and hypoarousal are not voluntary responses, and they are not your fault.

They happen when the survival parts of your brain decide you are in serious danger and step in to keep you alive, choosing the safest way to react. In that moment, the thinking part of your brain goes offline.

For example, if a bear is about to attack you, thinking through a plan won't save you. Getting ready to fight, flee, or stay still until the danger passes is much more likely to keep you alive. These nervous system reactions are completely normal and natural.

What is chronic arousal?

The problem comes when hyperarousal or hypoarousal keeps happening after the danger has passed.

Even when there is no real danger, reminders, memories, or feelings connected to the trauma, known as triggers, or feeling even slightly threatened, can put you back into a survival state. Your body wants to protect you and make sure nothing bad happens again.

This is why you might jump and feel sudden anger when someone surprises you, why you can't walk through the crosswalk where a car crash happened, or why you start to detach from the world when something consciously or unconsciously reminds you of your trauma.

When these states become chronic, the ongoing stress response can wear you down physically and emotionally. Sometimes your window may even shrink after trauma, so things that used to be easier to handle now feel overwhelming.

What keeps trauma responses going?

To make things more complicated, trauma memories are often stored differently from other memories.

Because they couldn't be processed in the usual way, they can feel more vivid and intrusive. It is common for trauma survivors to feel like they are still living in the moment it happened, and it can be very hard to stay connected to the present.

In a sense, your body and mind get stuck in survival mode, always scanning for threats. This keeps trauma responses showing up in your day-to-day life, as a way to protect you.

How do I build and stay inside my window of tolerance?

When you are healing from trauma, it helps to widen your window of tolerance and learn how to get back inside it when you've been pushed out.

Here are some ideas to help you regulate and grow your window:

1. Notice your different states: Noticing when you are outside your window makes it easier to figure out how to soothe yourself. If you feel more irritable or on edge than usual, or notice signs like a dry mouth or racing heart, you might be moving out of your window and into hyperarousal. If you suddenly feel very tired, foggy, cold, or numb, you might be moving into hypoarousal. Once you know your signs, you can explore what helps you get back in your window, like grounding exercises, deep breathing, physical activity, or other kinds of coping and self-care.
2. Find and create safety: A sense of safety is very important in managing trauma symptoms, because most of these reactions come from a need for safety. It can help to explore what brings you a sense of safety, both inside and around you, and build more of it into your life. You might find safety through kind self-talk or calming exercises, wrapping yourself in a blanket, carrying a comforting object, spending time with people and places you trust, or arranging your space so it feels secure.
3. Build predictability and routines: Creating or returning to routines and predictability can help build safety and support your basic care, like a regular sleep schedule, regular meals, and meeting your other basic needs.
4. Reach out for social support: Trauma often comes with guilt and shame, which can make it hard to talk about. But holding it all by yourself can be overwhelming and isolating. Although it's difficult, sharing your story and feelings with people you trust, and letting them support you, can help you heal. Your story is your own, and you deserve to keep the details to yourself. You don't need to share details to get support. Support doesn't have to mean talking, either. It could be simply having someone with you, doing something fun together, or other ways of connecting.
5. Treat yourself with patience and compassion: Guilt and shame are common for trauma survivors, and it's easy to slip into a loop of self-criticism, blame, or frustration. You might think, I should have known better, or it happened so long ago, I'm weak for still struggling. Treating yourself with kindness while you heal helps build an inner sense of safety, trust, and resilience. If that's hard, you might start by treating yourself the way you would treat a best friend going through the same thing. Healing from trauma takes time, and the road is easier with a supportive inner voice.
6. Seek professional support: Even with good social support and self-care, trauma rarely resolves quickly or easily. There may be parts of your story you don't want to share with even the closest people in your life, or that you want to understand better. The right therapist can walk alongside you as you understand, manage, and process trauma. You may want to look for trauma therapists who know the field of trauma and how to work with it, or therapists who work with your specific concerns.

One chapter in your story

Trauma can feel big, overwhelming, and at times never-ending. With the right support, you can manage it and take your life back.

What happened can't be undone, and the memories may never completely disappear. But instead of taking over your whole life, it can eventually become one chapter in the story you will keep writing.

Trauma Therapy in Alberta

If trauma has left you feeling stuck outside your window of tolerance, reaching out for support can help.

Trauma therapy offers a space to widen that window and build a greater sense of safety. A therapist can help you understand your responses and find your way back to yourself.

You can take your life back.

This article is for educational purposes only and is not a substitute for therapy, medical advice, diagnosis, or treatment.

If you or someone you care about is in crisis or at risk of harm, please get help now. Call 911 or go to your nearest emergency department. You can also call or text 988 any time for suicide and crisis support. For more options, see our crisis support page.

About the Author

Jiwon You is a Registered Psychologist specializing in trauma therapy and self-esteem therapy with adults. She is passionate about helping people heal from trauma and self-criticism so they can feel better and live more fulfilling lives. Jiwon offers services in Korean and English.