Expressive writing: what four decades of trials show, and why relief is not the measure

A paradigm built to test disclosure

Most claims about the value of “getting it out” are hard to test, because people choose when and how to express emotion. Expressive writing is an exception. In the paradigm introduced by Pennebaker and Beall (1986), participants are randomly assigned to write, typically for 15 to 20 minutes on several days, either about their deepest thoughts and feelings concerning a difficult experience or about a neutral topic. Because assignment is random and the task is standardised, differences in later outcomes can be attributed to the writing.

In the original study, students who wrote about both the facts of a traumatic event and their emotions about it made fewer visits to the health centre in the following months than controls, although they reported more distress immediately after writing; writing about only emotions or only facts did not produce the same pattern. The abstract of that study could not be re-verified for this library, so no numbers are reported for it here. Pennebaker (1997) later reviewed the growing literature and highlighted evidence that changes in the use of words related to causation and insight across sessions predicted benefit, which pointed towards cognitive processing rather than release alone. Both are discussed in Research note 01 and the advice on writing to make sense.

This note looks at what happened once the paradigm had been tested hundreds of times, which is where the most informative evidence lies. The broader term used in some syntheses is experimental disclosure, which includes writing and talking under the same randomised design.

The first syntheses

Smyth (1998) conducted a research synthesis of the written emotional expression task in healthy participants. Writing was found to lead to significantly improved health outcomes in four outcome types: reported physical health, psychological well-being, physiological functioning and general functioning. Health behaviours were not influenced. Writing also increased immediate, pre- to post-writing distress, and that increase was unrelated to health outcomes. The relation between writing and health was moderated by several variables, including whether participants were college students, gender, the duration of the manipulation, the publication status of the study and the specific writing instructions.

Two findings from this early synthesis remain central. The first is that the benefit appeared across different kinds of outcome, not only in one measure. The second is the dissociation between immediate distress and later outcome. Writing usually makes people feel worse right afterwards, and how much worse did not predict whether they benefited. That already separates the experience of the session from its measured effect.

The largest meta-analysis: small, positive, variable

Frattaroli (2006) noted that the two earlier meta-analyses had been small and had used fixed-effects methods, which limit generalisation beyond the included studies, and that many studies had been completed since. She collected 146 randomised studies of experimental disclosure and used random-effects analyses. Experimental disclosure was effective, with a positive and significant average effect size of r = .075. A number of moderators were identified.

An r of .075 is small by any convention for effect sizes. It is not nothing: a cheap, brief, self-administered task with a reliably positive average effect is of practical interest. But it is far from the picture of a powerful release that the popular idea of catharsis suggests. The average also conceals variation, which is what the moderator analyses are for. The abstract does not list which moderators were significant, and this library does not itemise them from secondary accounts.

Later syntheses in specific populations and outcomes

The broad average leaves open whether writing helps with the problems people most often hope it will help with. Three later meta-analyses address narrower questions.

Depressive symptoms. Reinhold, Bürkner and Holling (2018) meta-analysed 39 randomised controlled trials with 64 intervention-control comparisons in physically healthy adults with varying degrees of stress but without posttraumatic stress disorder. Expressive writing did not yield significant long-term effects on depressive symptoms. Effects were larger when the number of sessions was higher and when the writing topic was more specific. The authors conclude that the results did not support brief, self-directed expressive writing as an intervention that decreases depressive symptoms in this population, and that longer, more directed interventions with additional therapeutic support might produce different results.

Adolescents. Travagin, Margola and Revenson (2015) analysed 21 independent studies in young people aged 10 to 18. The overall mean effect was positive but relatively small (g = 0.127), with significant effects between 0.107 and 0.246 in the domains of emotional distress, problem behaviour, social adjustment and school participation. Few significant effects were found for moderators such as participant characteristics, instructions or design. Adolescents with high baseline emotional problems showed larger effects on school performance, and higher-dosage protocols, with more and to some extent more widely spaced sessions, showed larger effects on somatic complaints. The authors highlight the importance of modifying the traditional protocol to enhance its efficacy and reduce potential detrimental effects, and judge the evidence promising but not decisive.

Posttraumatic stress. Pavlacic and colleagues (2019) took a different analytic approach, pooling change within the expressive writing conditions only rather than comparing writing with control groups. They found a small overall effect for posttraumatic stress and negligible to small effects for posttraumatic growth and quality of life; studies that required a diagnosis of posttraumatic stress disorder showed a medium to large effect. Because there is no comparison with a control condition, this analysis cannot separate the effect of writing from natural recovery, regression to the mean or repeated measurement. It is graded lower in this library for that reason, and its larger effect in people diagnosed with PTSD should not be read as evidence that writing treats PTSD.

What moderates the effect

Across these syntheses, a few themes recur, although each rests on moderator analyses, which are observational comparisons between studies rather than experimental tests.

• Dose. More sessions were associated with larger effects on depressive symptoms, and higher-dosage protocols with larger effects on somatic complaints in adolescents. The duration of the manipulation was already a moderator in the first synthesis.
• Instructions and focus. Specific writing topics were associated with larger effects than open ones in the depression meta-analysis, and writing instructions were a moderator in the first synthesis. This fits the early finding that writing about both facts and feelings differed from writing about feelings alone.
• Who writes. Student samples, gender and baseline problems appeared as moderators in different syntheses. The pattern does not add up to a simple rule about who benefits.

Sloan and Marx (2004) reviewed the theories proposed to explain the paradigm and concluded that, although it may produce beneficial effects for some individuals, it remained unclear why it works and for whom it is best suited. Later syntheses have narrowed but not closed that gap.

Relief and benefit are different measurements

The expressive writing literature offers one of the clearest demonstrations in psychology that how a procedure feels and what it does can come apart.

First, the session itself tends to be unpleasant. Smyth found that writing increased immediate distress, and that increase did not predict health outcomes. People who felt worse after writing were not thereby less likely to benefit, and people who felt better were not thereby more likely to.

Second, when benefit appears, it appears later, over weeks or months, and in outcomes such as health centre visits, well-being and functioning, not in the mood at the end of the session.

Third, the features associated with benefit are those of sense-making rather than discharge: writing about facts and feelings together, specific topics, repeated sessions, and changes in causal and insight language. Pouring out feeling without building an account is not what the successful protocols asked people to do.

This has a direct consequence for anyone who uses writing informally. The sense of relief at the end of a writing session, or its absence, is weak evidence about whether the practice is helping. A more informative check is whether, over days, the account of the experience has become more coherent, whether the same fragments still intrude in the same form, and whether anything has changed in understanding or in what one does (Research note 04).

When writing may resemble rumination

If writing helps through sense-making, then writing that circles the same feelings without development may resemble rumination, the repetitive, passive focus on distress that is associated with more symptoms (Research note 15). None of the syntheses above directly tested this possibility, so it is a reasoned hypothesis, not a finding. It is consistent with the evidence on perspective: reflecting on an upsetting experience from a self-distanced perspective reduced emotional reactivity and rumination compared with immersed recall (Kross, Ayduk & Mischel, 2005). A written account that steps back from the experience may differ from one that re-immerses the writer in it.

The adolescent meta-analysis’s reference to potential detrimental effects is a further reminder that writing about painful material is not risk-free for everyone, and that protocols can be adapted to reduce harm.

What the evidence supports, and what it does not

The evidence supports expressive writing as a low-cost practice with a small average benefit across many randomised studies, with larger effects associated with more sessions and more specific topics, and with a short-term increase in distress that is expected and not in itself a warning sign. It does not support expressive writing as a treatment for depression in the form of brief, self-directed sessions, as a treatment for posttraumatic stress disorder, or as a reliable way of discharging emotion. It does not predict who will benefit.

In the language of this library, expressive writing is best understood as a structured opportunity for meaning-making whose average effect is modest and whose value for a particular person is unknown in advance.

Practical implications, with limits

• Write about facts and feelings together, over several sessions. The protocols with benefits used repeated sessions and asked for both.
• Choose a specific topic. Specific topics were associated with larger effects on depressive symptoms than open ones.
• Expect to feel unsettled afterwards. Immediate distress was unrelated to later benefit; neither relief nor discomfort at the end of a session tells you much.
• Look for change in the account, not in the intensity of feeling. If the same material repeats unchanged, a different approach, such as stepping back or moving to concrete steps, may help more (Advice).
• Do not use writing in place of treatment. Persistent low mood, trauma-related symptoms or writing that leaves you overwhelmed rather than temporarily unsettled warrant speaking with a qualified professional.

These implications follow from the syntheses but have not been tested as a package.

Limits of the evidence

The meta-analyses pool studies with different populations, instructions, doses and outcomes; the average effect is small and heterogeneous. Moderator findings compare studies rather than testing conditions experimentally. The largest meta-analysis’s moderators are not itemised in its abstract. Many trials used student samples and self-reported outcomes, and publication status was itself a moderator in an early synthesis. The posttraumatic stress meta-analysis lacks control comparisons. The original 1986 study could not be re-verified from an abstract. The evidence ledger records the grade and review date of each claim.