Post-traumatic stress: when a past event does not stay in the past

An accident, an assault, a natural disaster, a sudden loss or a frightening medical experience can leave a mark that lasts longer than the event itself. In the days and weeks that follow, nightmares, being easily startled and vivid memories are common; they are part of how the mind processes what happened.

For many people these reactions fade with time and support. When they do not, and the event still feels as if it is happening now, post-traumatic stress disorder may be present.

Common symptoms

Intrusive memories, flashbacks and nightmares bring the event back uninvited. A person may avoid places, conversations or reminders linked to the event and feel constantly on guard: startling easily, sleeping poorly, struggling to concentrate.

Changes in mood and outlook are also common: guilt, shame, anger, feeling cut off from others or losing interest in things that used to matter.

Why does the memory stay so vivid?

During an overwhelming event the mind focuses on survival, and the memory is stored in fragments, heavily charged with emotion. Afterwards, small reminders can set off the original alarm response again, even when the person is safe.

Avoidance is an understandable response, but it also stops the memory from being processed. Over time the world can start to feel narrower and more dangerous than it really is.

How psychotherapy helps

Trauma-focused work begins with safety and stabilisation: understanding the reactions, learning ways to calm the body and building a routine that supports recovery. Only after this is the memory itself approached, at a pace the person can manage.

EMDR is a structured, evidence-based approach used to reprocess traumatic memories; it is applied where clinical assessment finds it appropriate. Work based on Cognitive Behavioural Therapy looks at the meanings the event has taken on — such as the world never being safe, or the fault lying with the person — and gradually reduces avoidance. The aim is not to forget, but for the memory to lose its power over the present.

When to seek support

If symptoms last longer than a month, get worse rather than better, or affect work, relationships or sleep, an assessment is a good idea. Support also helps family members who are trying to help someone close to them.

Where symptoms are severe, psychotherapy can run alongside a psychiatric assessment.