Written exposure therapy (WET) is a short, structured treatment for PTSD that uses repeated writing about a traumatic memory to reduce symptoms. Developed by psychologists Denise Sloan and Brian Marx, it condenses trauma treatment into just five sessions, making it one of the briefest evidence-based options available. It is recommended by the VA/DoD Clinical Practice Guideline for treating PTSD.
How It Works
The core idea behind WET is straightforward: when you repeatedly revisit a traumatic memory in a controlled way, your brain gradually learns that the memory itself is not dangerous. This process, sometimes called fear extinction, is the same principle behind other exposure-based therapies. By writing about the trauma in detail, you activate the fear response tied to the memory. Over time, your nervous system learns that the distress is temporary and that nothing bad happens from remembering.
Through this process, you begin to internalize several things: the trauma memory can be experienced without overwhelming distress, the physical reactions like a racing heart or sweating are uncomfortable but not harmful, and the emotional pain fades on its own even without doing anything to stop it. Many people also develop new ways of thinking about what happened to them and what it means, which researchers believe is an additional mechanism driving recovery.
What a Session Looks Like
WET follows a scripted protocol across five weekly sessions, each lasting about an hour. The treatment wraps up in roughly one month. During each session, your therapist gives you a specific writing direction, and you spend 30 minutes writing about your traumatic experience in detail, focusing on the thoughts and emotions you had at the time of the event. After you finish writing, you talk briefly with your therapist about how the experience went.
There is no homework between sessions. Your therapist will simply ask you to try not to avoid trauma memories if they come up during the week, but there are no writing assignments or worksheets to complete at home. This is a notable departure from other trauma therapies, which often require substantial between-session work.
How It Compares to Other PTSD Treatments
The two most established PTSD treatments, Cognitive Processing Therapy (CPT) and Prolonged Exposure (PE), typically require 12 sessions and involve significant homework. WET achieves comparable results in less than half the time. A randomized trial with military service members found that WET was noninferior to CPT, meaning the difference in symptom reduction between the two treatments fell within an acceptable range at every time point measured. By 30 weeks after starting treatment, the gap between the two groups had essentially closed, with nearly identical average improvements.
At the 30-week mark, 47% of WET participants showed reliable symptom improvement compared to 38% of CPT participants. These numbers suggest WET is not just a compromise for people who can’t commit to longer treatment. It is a genuinely effective option in its own right.
Dropout Rates Are Notably Low
One of WET’s strongest advantages is that people actually finish it. Dropout is a major problem in trauma therapy: roughly 36 to 45% of patients assigned to CPT or Prolonged Exposure quit before completing treatment. The reasons vary, but the length of treatment, the intensity of homework, and the emotional demands of 12 or more sessions all contribute.
WET’s dropout rates are dramatically lower. In a civilian sample, only 6% of WET participants dropped out compared to 39% in CPT. Among military service members, 24% dropped out of WET versus 45% for CPT. In a study comparing WET to Prolonged Exposure in veterans, 13% left WET early compared to 36% who left PE. A treatment only works if people complete it, and WET’s brevity and simplicity keep far more people engaged through the finish line.
Why Writing Specifically
Writing serves as a controlled form of exposure to the trauma memory. When you write in detail about what happened, including what you saw, felt, and thought, you activate the same fear network in your brain that fires during flashbacks or intrusive memories. But you do it in a safe, structured environment where nothing threatening actually happens. Your brain registers this mismatch between the expected danger and the actual safety, and over repeated sessions, the emotional charge attached to the memory weakens.
Research on the treatment’s mechanisms has found that two markers predict better outcomes: an initial spike in physiological arousal when writing (indicating the fear memory has been activated) and a gradual decrease in self-reported distress across sessions (indicating the brain is learning new, non-threatening associations). Both of these align with what scientists would expect if fear extinction is driving the improvement. There is also evidence that cognitive shifts play a role. People begin to reinterpret the meaning of their trauma, which contributes to lasting symptom relief.
Who It’s Designed For
WET was developed specifically for adults with PTSD, and the research base includes both civilian and military populations. It has been tested with survivors of motor vehicle accidents, combat veterans, and other trauma-exposed groups. Because the treatment is brief, highly structured, and requires no homework, it can be especially practical for people who face barriers to longer therapies: those with demanding schedules, limited access to weekly appointments over several months, or difficulty tolerating the extended emotional commitment of 12-session protocols.
The treatment uses a scripted manual, which means therapists can learn to deliver it with relatively focused training compared to more complex modalities. The VA’s National Center for PTSD provides a step-by-step clinician manual designed as the primary resource for any mental health professional implementing the treatment.