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What is Trauma?
Dr Rachel Lee, Consultant Clinical Psychologist & Trauma Specialist
If you've ever wondered whether what you went through "counts" as trauma, or quietly asked yourself "What's wrong with me?", this post is for you. Here's how I think about trauma, and why I believe that it says far more about what happened to you than about you.
Most people think trauma is defined by the event, and assume the event has to be something "big" or life-threatening, like a serious car accident, an assault, or a natural disaster. These events can certainly cause post-traumatic stress, but trauma is not limited to events like these, and it's important to remember that not everyone who goes through them develops trauma symptoms or post-traumatic stress.
I see trauma as the impact of an experience, not the experience itself. It refers to the effect of an experience, or series of experiences, on your sense of who you are, the way you experience and view the world, your thoughts, emotions, behaviours, and your nervous system.
You can't tell whether someone has trauma by looking at what happened to them. Instead, trauma is defined by the ongoing psychological and physiological impact of what happened.
If you had a distressing experience that overwhelmed your ability to cope, or that left you feeling unsafe or alone, and that you re-experience in flashbacks, disturbing dreams or intrusive memories, that affects how you feel, think, act, sleep, or relate to others, you may be experiencing trauma. Even if you believe what happened to you "wasn't that bad".
In my clinical practice, I have helped people recover from trauma caused by a whole range of experiences, including bullying, workplace harassment, witnessing an accident, complex pregnancies and births, serious injuries, medical procedures, intensive care admissions, suicide, traumatic bereavements, childhood abuse and neglect, relationship betrayal, accidents, assaults and natural disasters, and more. As you can see, there is a huge variety in the types of events that can lead to trauma.
Sometimes people can't understand why a particular event has caused trauma symptoms when they have been through worse in the past and made a full recovery. At other times, people compare themselves unfavourably to family or friends, thinking "My friend went through something much more frightening and she's fine. What's wrong with me?". This can lead to self-blame, guilt and shame.
However, when we look at the scientific research, it confirms that experiencing trauma does not imply there is something wrong with you, or with your ability to cope with life. Instead, it highlights that trauma says a lot more about what happened to you, and the type of support you experienced at the time or afterwards.
It is entirely possible to go through highly distressing events and recover naturally over time, and many people do. At the same time, post-traumatic stress is more common than most people realise. A large review of trauma research showed that the lifetime prevalence of post-traumatic stress disorder in civilian (non-military) populations varied from 3.4% to 26.9%, suggesting that roughly up to a quarter of people will experience PTSD in their lifetime (Shein et al., 2021). Prevalence rates naturally vary by setting, incident type and the population studied, which is why the range is so wide.
Why do some people develop trauma when others don't?
I've helped hundreds of people recover from trauma-related difficulties. I notice that trauma tends to develop when an experience overwhelms our capacity to cope at the time: when we face a serious physical or psychological threat, when we feel powerless, humiliated or alone, when all of our resources go into simply surviving the moment, leaving nothing available to process what is happening. At times of severe threat, we will either fight, flee, freeze or fawn, depending on what the threat system in the brain decides is most helpful for our survival.

I've helped hundreds of people recover from trauma-related difficulties. I notice that trauma tends to develop when an experience overwhelms our capacity to cope at the time; when we face a serious physical or psychological threat, when we feel powerless, humiliated or alone, when all of our resources go into simply surviving the moment, leaving nothing available to process what is happening. At times of severe threat, we will either fight, flee, freeze, flop or fawn, depending on what the threat system in the brain decides is most helpful for our survival.
Research has shown that dissociating during an event, feeling unreal, detached or disconnected, is a predictor of later post-traumatic stress, because it interrupts the way the brain processes the experience. This can leave us with fragmented memories that feel very vivid and current, with a "happening now" quality that makes us feel as though we are back there again.
A meta-analysis by Brewin and colleagues (2000) concluded that factors related to what happened during or after the trauma, such as the severity of the experience, lack of social support, and additional life stress, were bigger predictors of post-traumatic stress than pre-trauma characteristics. Similarly, Ozer and colleagues (2003) found that what happens psychologically around the time of the event, not a person's prior characteristics, was the strongest predictor of PTSD. This shows that trauma is more about what happened than who it happened to.
When trauma dysregulates your nervous system, the "window" within which you can comfortably handle stress, often called the window of tolerance, narrows. With a narrower window, it takes much less to push you out of it. Above the window is hyperarousal, where we are more easily tipped into intense states: feeling panicky or on edge, snapping at others, irritability, anger. Below the window is hypoarousal, which can happen when we feel overwhelmed and we may experience shutdown, zoning out, numbness, flatness, exhaustion, or a sense of disconnection from ourselves, other people or the world. Many people swing between the two, sometimes in the same day and may have few times when they feel joyful, calm, content or relaxed. This tells us we need to find ways to widen the window.
To put it simply, trauma dysregulates the way the nervous system responds to the world. This is why you can't "just move on" or "think positive". Those instructions speak to your rational mind, but trauma responses live in both the mind and the body. Recovery usually involves working with your nervous system by first helping your body to feel safer, then helping the brain to process the memory and file it away with all your other long-term memories.
If you'd like to get some trauma-focused strategies that will help you to to cope with flashbacks, distressing thoughts or strong emotions, you might like to download my free Trauma Recovery Starter Kit.
It includes
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The What is trauma? guide, which takes these ideas a step further and includes four trauma-focused coping strategies.
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A coping card that you can save to your camera roll that includes a reminder of three strategies for hyperarousal and aso strategies for hypoarousal too.
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Three audio files where I guide you through three helpful strategies in real time.
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A guide for anyone who is supporting you at the moment, so that they can better understand what you are experiencing and helpful ways to support you.
I've included the ideas and strategies that have helped my clients, click the button below to get immediate access.
© Dr Rachel Lee (2026) www.northstarpsychology.co.uk
