Why Trauma Feels Like It's Still Happening — And What EMDR Does About It

"Traumatized people chronically feel unsafe inside their bodies: the past is alive in the form of gnawing interior discomfort." — Bessel van der Kolk

In this article

• When the Past Won't Stay in the Past
• How Ordinary Memories Work
• What Goes Wrong With Traumatic Memories
• What EMDR Does
• What Happens in a Session
• Who It Helps

If you've experienced trauma, you may have noticed something that's hard to put into words: certain memories don't feel like memories. They feel like something that is still happening. A smell, a sound, a particular quality of light — and suddenly you're not just remembering something; you're back inside it. Your heart rate climbs. Your body responds as if the threat is present. The thinking part of your brain goes offline.

This is not a character flaw, and it's not a sign that you're too sensitive or haven't tried hard enough to move on. It's a neurological phenomenon — and understanding it changes everything about how recovery becomes possible.

When the Past Won't Stay in the Past

Most people assume that trauma is about the event itself. Something terrible happened, and now you have memories of something terrible. The challenge, on this understanding, is to come to terms with those memories — to process them, make meaning of them, find a way to live alongside them.

This is partly true. But for many people who've experienced trauma, the harder problem isn't the memory itself. It's the fact that the memory keeps arriving as if it's happening now. Flashbacks, intrusive images, physical sensations with no apparent trigger, the sense of being pulled without warning into a moment that happened years ago. The past doesn't feel like the past.

EMDR — Eye Movement Desensitisation and Reprocessing — was developed specifically for this problem. To understand why it works, it helps to understand why traumatic memories behave so differently from ordinary ones.

How Ordinary Memories Work

When we have an ordinary experience — a good meal, a difficult conversation, a long drive — the brain processes it during and after the event. The hippocampus tags it with context: who was there, where you were, how long ago it happened. The experience gets consolidated into long-term memory with those contextual markers attached, which is why most memories feel like something you're looking back on rather than something you're inside.

This processing also involves some editing. Not in a distorting sense, but in an adaptive one: the emotional weight of an experience tends to decrease over time as the memory is consolidated and re-consolidated through sleep, reflection, and the simple passage of days. Most things that upset us eventually soften at the edges.

What Goes Wrong With Traumatic Memories

Trauma disrupts this process. When an experience is overwhelming enough — either because of its nature, its timing, or the absence of support around it — the normal consolidation process can break down. The memory gets stored differently: raw, unprocessed, stripped of the contextual tags that would mark it as something in the past.

This is why traumatic memories arrive with the full sensory and emotional charge of the original experience. The brain hasn't filed them as history. They live closer to the surface than ordinary memories, more easily triggered, and more difficult to regulate once activated. The nervous system responds to the memory the same way it responded to the original event — because as far as the brain's threat-detection system is concerned, there is no meaningful difference between the two.

What EMDR Does

EMDR works directly with this storage problem. Developed by psychologist Francine Shapiro in the late 1980s, it uses bilateral stimulation — typically guided eye movements, though sometimes tapping or alternating sounds — while the person holds the traumatic memory in mind.

The leading theory is that bilateral stimulation activates a process similar to what happens during REM sleep, when the brain naturally processes and consolidates the day's experiences. By pairing the traumatic memory with this kind of stimulation, EMDR appears to help the brain do the processing that didn't happen at the time — integrating the memory, reducing its emotional charge, and crucially, tagging it as something in the past rather than something present.

The result, for many people, is not that the memory disappears. It's that the memory loses its grip. They can think about what happened without being flooded by it. The past, finally, begins to feel like the past.

What Happens in a Session

EMDR is more structured than many forms of therapy, and sessions have a clear shape. After a thorough history and preparation phase — which involves building the skills to stay regulated during the processing work — the therapist and client identify the specific memory or memories to target.

During the processing phase, the client holds the memory in mind while following the therapist's hand movements, or while tapping, or listening to alternating tones through headphones. They're not asked to narrate what they're experiencing in detail — the work is less verbal than most people expect. The therapist guides the process in short sets, checking in regularly, adjusting based on what the client notices.

Between sessions, the processing often continues. Dreams may shift. Memories may surface. Most people find that the work has a momentum to it — each session building on the last.

Who It Helps

EMDR has the strongest evidence base for PTSD, and is recognised by the WHO and other major health bodies as a first-line treatment. But the research has expanded considerably since Shapiro's early work, and it is now used effectively for:

• Single-incident trauma (accidents, assaults, medical events)
• Complex or developmental trauma (childhood abuse or neglect, prolonged difficult experiences)
• Phobias and anxiety disorders with a clear triggering event
• Grief and loss
• Performance anxiety with an identified root experience

It tends to suit people who have found talk-based therapy helpful but incomplete — who have the insight and the language but find that the emotional charge of certain experiences hasn't shifted through talking alone. It also suits people who struggle to speak about what happened; because EMDR is less reliant on verbal narration, it can reach experiences that are hard to put into words.

It is not the right fit for everyone, and good EMDR practice involves careful assessment and preparation before any processing begins. A competent EMDR therapist will not rush you into the memory work before you're ready.

Key Points to Keep in Mind

• Traumatic memories feel present because of how they're stored — not because you're stuck, or weak, or failing to move on.

• EMDR doesn't require you to narrate your trauma in detail. Much of the work is internal, with the therapist guiding the process rather than drawing the story out.

• Preparation matters. If a therapist suggests skipping straight to processing, that's worth querying. The stabilisation phase is not optional.

• EMDR is not a quick fix, but it is often faster than people expect. For single-incident trauma, significant change can happen in a small number of sessions.

• The research is robust. EMDR is one of the most well-evidenced treatments in trauma psychology — not an alternative therapy, but a mainstream one.

• Emma Steains, our clinical psychologist at Unison, specialises in EMDR and complex trauma. If you'd like to find out more about whether it might suit you, a free 15-minute fit call is a good place to start.

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