Does journaling help with stress and anxiety? What the evidence shows

Keeping a journal about your thoughts and feelings has a measurable but modest effect on mental and physical health: pooled across 146 randomised experiments, the average benefit was small, an effect size of r = .075 [s1]. It is a low-cost, low-risk practice that helps some people somewhat — not a treatment that reliably resolves an anxiety disorder [s1].

This article describes published research into a self-help practice. It is not medical advice, and it is not a substitute for care for an anxiety or mood disorder.

What the research actually tested

Most of the evidence comes from a specific technique psychologists call experimental disclosure, or expressive writing: people are asked to write, usually for a few sessions, about their deepest thoughts and feelings on a stressful or traumatic experience [s1]. It is the closest thing to the popular idea of "journaling to feel better" that has been studied under controlled conditions, and it has been tested many times.

The size of the effect

The most complete synthesis is a 2006 meta-analysis in Psychological Bulletin that collected 146 randomised studies of experimental disclosure [s1]. Using a random-effects model — the more conservative choice, and one that supports broader generalisation than the fixed-effects approach used in earlier, smaller reviews — it found that disclosure produced a positive and statistically significant average effect, with an r-effect size of .075 [s1].

That number is the whole story in miniature. An r of .075 is, by convention, a small effect: real, reliably above zero across a large body of trials, but modest in magnitude. The review also identified moderators — features of who writes, about what, and how — that shift the size of the benefit [s1], which is another way of saying the practice works better for some people and some situations than others.

A more recent, everyday version

Closer to the phone-based journaling apps people actually use, a 2018 randomised controlled trial in JMIR Mental Health tested a web-based "positive affect journaling" programme in 70 adults who had a range of medical conditions and elevated anxiety symptoms [s2]. Half were assigned to journal online for 15 minutes on three days a week for 12 weeks; half received usual care [s2].

The journaling group showed decreased mental distress and increased well-being relative to their own starting point, and, compared with usual care, reported fewer depressive symptoms and less anxiety after one month and greater resilience over the first two months [s2]. The authors framed it plainly as a preliminary trial [s2] — one small study, not a definitive result — but it points the same direction as the older literature: a genuine, moderate benefit for distress and anxiety symptoms.

How to read "it works"

Both the large meta-analysis and the small modern trial agree that writing about feelings helps, and both agree the help is modest [s1][s2]. That combination is the honest headline. Journaling is cheap, carries little risk, and for many people nudges stress and low mood in the right direction — but the average effect is small, and it is not a stand-in for therapy or medication when anxiety is clinical.

That places it alongside the other accessible self-help practices this site has weighed. The evidence for breathing exercises and for mindfulness apps follows the same curve: real, small, and easy to oversell. A network meta-analysis of wellbeing interventions makes the general point — many low-cost practices help a little, and none is a magic lever.

What to watch

The useful open questions are practical: which format of journaling helps most, for whom, and whether the early gains last beyond a few months. The 2018 trial was small and short [s2], and the meta-analysis pooled decades of varied designs [s1]. Better-powered trials of the app-delivered versions people now reach for would sharpen the advice. In the meantime, the defensible read is that a journal is a reasonable, low-stakes tool for everyday stress — worth trying, not worth overpromising.

Sources

• Experimental disclosure and its moderators: a meta-analysis — Psychological Bulletin, 2006-10-30
• Online Positive Affect Journaling in the Improvement of Mental Distress and Well-Being in General Medical Patients With Elevated Anxiety Symptoms: A Preliminary Randomized Controlled Trial — JMIR Mental Health, 2018-09-16