What is PTSD?
Post-traumatic stress disorder develops in some people following exposure to a traumatic event — an experience involving actual or threatened death, serious injury, or sexual violence, either directly experienced, witnessed, or learned about in relation to a close person. Not everyone who experiences trauma develops PTSD. Approximately 20-30% of people exposed to qualifying trauma go on to meet diagnostic criteria, with risk factors including the severity and duration of the trauma, prior trauma history, limited social support, female sex, and individual neurobiological vulnerability.
PTSD is characterised by four symptom clusters recognised in DSM-5 and ICD-11. Intrusion symptoms include flashbacks, nightmares, and intrusive memories that feel present-tense rather than historical — as if the trauma is happening now rather than having happened in the past. Avoidance involves deliberate efforts to avoid trauma-related thoughts, feelings, memories, people, places, and situations. Negative alterations in cognition and mood include distorted self-blame, persistent negative emotions such as fear, horror, anger, guilt, or shame, estrangement from others, and inability to experience positive emotions. Alterations in arousal and reactivity include hypervigilance, exaggerated startle response, sleep disturbance, irritability, and in some cases reckless or self-destructive behaviour.
Why Traumatic Memories Are Different
The reason PTSD responds well to psychological therapy lies in understanding how traumatic memories are processed and stored differently from ordinary autobiographical memories. Normal memories are consolidated into coherent narrative form — they have a beginning, middle, and end; they feel firmly located in the past; they can be recalled deliberately without the associated emotions overwhelming the present moment. Traumatic memories, however, are often encoded in a fragmented, sensory, context-free form, because the hippocampus — the brain region responsible for contextualising experience in time — is impaired by extreme stress hormones during trauma.
This is why flashbacks feel present-tense rather than historical. The memory has not been properly contextualised as something that happened in the past; it remains an active, undifferentiated threat. Effective therapy works by facilitating the proper processing and consolidation of traumatic memories — helping the brain integrate what happened into coherent, contextualised, past-tense narrative.
NICE-Recommended Treatments for PTSD
Trauma-Focused Cognitive Behavioural Therapy (TF-CBT)
Trauma-focused CBT is NICE's first-line recommendation for PTSD and has by far the most extensive evidence base of any PTSD treatment. TF-CBT is a structured approach that combines psychoeducation about trauma and the PTSD cycle; imaginal exposure — working systematically with the traumatic memory in session, recounting it in the present tense in increasing detail until it loses its overwhelming emotional charge; in-vivo exposure — approaching avoided reminders of the trauma in real life; cognitive restructuring of trauma-related beliefs such as self-blame, permanent dangerousness of the world, and permanent damage to the self; and relapse prevention planning. TF-CBT typically runs for 8-12 sessions for single-incident PTSD, and considerably longer for complex or multiple-trauma presentations.
Prolonged Exposure
Prolonged Exposure, developed by Edna Foa at the University of Pennsylvania, involves repeated, systematic confrontation with both trauma memories through imaginal exposure and avoided situations through in-vivo exposure, sustained until the distress response reduces through habituation. PE is highly effective and particularly well-researched in military veteran and sexual trauma populations, with decades of supporting RCT evidence.
Complex PTSD: Different Requirements
Complex PTSD, recognised formally in ICD-11 as distinct from standard PTSD, develops following prolonged, repeated trauma — particularly beginning in childhood or involving interpersonal violation by a caregiver. It includes the core PTSD symptom clusters plus three additional domains of disturbance in self-organisation: severe difficulties with emotional regulation and recovery from emotional states; a pervasive negative self-concept characterised by chronic shame and feelings of worthlessness or permanent damage; and significant disruption to the capacity for relationships, trust, and intimacy.
Treatment for C-PTSD requires a carefully phased approach that is the clinical consensus across all major guidelines. Phase one focuses on stabilisation and safety — building the therapeutic relationship, developing emotional regulation skills, establishing grounding techniques, and psychoeducation. Proceeding directly to trauma processing without adequate stabilisation risks overwhelming a nervous system and emotional regulation system shaped by chronic overwhelm. Phase two involves structured, paced processing of traumatic memories, always within the client's window of tolerance. Phase three integrates gains and supports reconnection to life, relationships, values, and meaning. Schema therapy is particularly well-suited to complex trauma presentations, directly targeting the negative core beliefs about self that are characteristic of C-PTSD.
What Therapy Cannot Do
Therapy for PTSD does not erase traumatic memories or make what happened not matter. The goal is not to forget what happened but to change the way the memory is stored, processed, and experienced — moving it from an intrusive, present-tense, overwhelming activation to a contextualised past memory that can be recalled without being flooded. People who have completed successful PTSD treatment consistently report that they can think and speak about what happened without being overwhelmed by it, and that their life is no longer organised around avoiding reminders of the trauma.
Online PTSD Therapy
Online delivery of trauma-focused therapy has been extensively researched. Multiple RCTs and meta-analyses confirm equivalent outcomes for online TF-CBT compared with in-person delivery on measures of PTSD severity, depression, and functional impairment. For many trauma survivors, attending from home — a familiar, personally controlled environment — reduces the hypervigilance that attending a clinic can trigger in the early stages of treatment, making online therapy not just equivalent but in some cases preferable.
Frequently Asked Questions
Single-incident PTSD: typically 8-16 sessions of TF-CBT. Complex PTSD: typically 20-40+ sessions across a longer phased timeframe of 1-3 years, given the depth of what needs to change. Your therapist will give a more specific estimate following full assessment.
In TF-CBT, you will work with trauma memories in a structured, paced way — always at your own pace and with your full consent, never more than you are ready for. TF-CBT requires less detailed verbal recounting than imaginal exposure approaches. You will never be pushed further than you are ready to go.
Multiple-trauma presentations are common and treatable. They typically require longer treatment and more careful pacing. A thorough assessment will identify which traumas are most central to your current symptoms and develop a prioritised treatment plan. Multiple traumas are not a barrier to effective treatment — they simply require a more extended and carefully structured approach.
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Mindful Talk Therapy Scotland provides BACP and BABCP members online therapy across Scotland. Free 15-minute consultation. No GP referral needed. First appointment within 5-10 working days.
Related Reading
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