Does journaling help with stress and anxiety? What the evidence says, including the caveats

Last updated: October 2026 · By Thomas Lovas Lokoy, founder & builder of BrainLoop. AI-assisted draft checked against the sources at the end. This is general information about research, not medical advice. If you are in distress, talk to a doctor or a qualified therapist.

If you have searched "does journaling help with anxiety", you have seen two kinds of answer: the glowing kind, which treats a notebook as a cure, and the dismissive kind, which calls it a fad. The research sits between them and is more interesting than either. There is a specific writing exercise with a real evidence base. It is not quite the same thing as keeping a daily diary, it has side effects, and it has groups of people it did not help. Here is what the literature I read actually says.

The exercise that was studied is narrower than "journaling"

Most of the evidence comes from a paradigm called expressive writing. In a 2005 review in Advances in Psychiatric Treatment, Baikie and Wilhelm describe it plainly: "In the expressive writing paradigm, participants are asked to write about such events for 15–20 minutes on 3–5 occasions", where "such events" means traumatic, stressful or emotional experiences. Control groups write about neutral topics "as objectively and factually as possible".¹

That is the first thing to hold on to. The studied intervention is short, bounded and deliberately emotional: a handful of sessions, each a quarter of an hour, about something that matters. It is not "write what you had for lunch every day for a year". A daily journal can contain expressive writing, but the two are not the same, and the evidence transfers only as far as the overlap.

What improved

Baikie and Wilhelm report that people who do the exercise "generally have significantly better physical and psychological outcomes compared with those who write about neutral topics". Their list of outcomes reported across studies includes fewer stress-related visits to the doctor, improved immune system functioning, reduced blood pressure, improved lung function, fewer days in hospital, improved mood, fewer post-traumatic intrusion and avoidance symptoms, reduced absenteeism from work, and higher student grade point averages.¹

Some of those are striking, so a sober note: that is a list of findings that appeared somewhere in the literature, not a promise that each one happens to each writer. The authors themselves add that "the findings for emotional health are not as robust or as consistent as those for physical health".¹ In other words, the thing most people search for, feeling less anxious, is the part of the evidence that is least consistent.

The quantitative backbone is Smyth's 1998 meta-analysis in the Journal of Consulting and Clinical Psychology, which pooled the expressive-writing studies on healthy participants. It found improvements across self-reported physical health, psychological well-being, physiological functioning and general functioning. Health behaviours did not change; people did not start exercising or sleeping differently because they had written.²

The side effect nobody puts in the headline

Both sources agree on one thing that marketing never mentions: writing about painful things makes you feel worse first. Baikie and Wilhelm: "Expressive writing is generally associated with an immediate increase in negative affect."¹ Smyth's meta-analysis found the same temporary rise in distress, and found that it was not linked to the later health benefits.² The low mood after a hard entry is normal and short-lived in these studies, but if you are already fragile it is worth knowing it is coming, and worth not writing about the worst thing in your life at midnight before a difficult day.

Who it did not help

The review is unusually honest about its failures, and I would rather you read them here than discover them. "Limited benefits were obtained for male psychiatric prison inmates", and, more seriously, "compared with controls, expressive writing was detrimental for adult survivors of childhood abuse".¹ The authors close with a line that should sit over every journaling app, including mine: it "should not replace appropriate medical or psychological treatment in clinical populations".¹

So the honest answer to "does journaling help with anxiety?" is: a specific kind of writing has helped many healthy people on several measures, the emotional benefits are the least reliable part, it stings before it helps, and for some groups with serious histories it has done harm. If that describes you, the right first step is a professional, not a prompt.

What this means for a daily journal app

I build one, so let me be specific about where BrainLoop's Journal sits relative to the research.

It is not the expressive-writing protocol. The prompts are generated to be "warm and specific, never clinical", and they lean toward reflection, gratitude and growth rather than toward your most traumatic memory. That is a design choice for a tool people open casually. If you want to run the actual exercise, you can: pick an event that matters, write for fifteen to twenty minutes, do it on three to five days, and ignore the prompt. Nothing in the app stops you.

Your text stays with you. When you press New prompt, only your selected mood label is sent to the AI; the entry itself is saved in your browser on your device and never uploaded. For writing about difficult things, that matters.

The mood faces are a label, not a diagnosis. You pick Great, Good, Okay, Low or Bad and the app uses it to shape the next prompt. It does not score you, trend you or tell you anything about your mental health, and I would be wary of any app that claims to from five emoji.

Expect the dip. If you write about something hard, the research says you may feel worse for a bit. That is not the app failing. Write earlier in the day, and give yourself something ordinary to do afterwards.

A sensible way to use it

• For ordinary stress: a few lines most days, using the prompt, noting the mood. Modest, low-risk, and the part of journaling that is simply pleasant.
• For a specific hard event: the fifteen-to-twenty-minute, three-to-five-session pattern from the studies, written for yourself, with the knowledge that the first sessions may hurt.
• For clinical anxiety, trauma or abuse history: a professional first, and the journal, if at all, as something you agree with them.

The short version

Expressive writing, 15–20 minutes on 3–5 occasions about something emotional, has a real evidence base for physical and some psychological outcomes in healthy adults. The emotional-health findings are the least consistent. It raises distress briefly before any benefit. It did not help some groups and harmed one. A daily journal app is a gentler cousin of that exercise, useful for everyday reflection and a reasonable place to run the real protocol if you choose to, but not a treatment and never a substitute for one.

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Sources

Footnotes

1. Baikie, K. A., & Wilhelm, K. (2005). Emotional and physical health benefits of expressive writing. Advances in Psychiatric Treatment, 11(5). https://www.cambridge.org/core/journals/advances-in-psychiatric-treatment/article/emotional-and-physical-health-benefits-of-expressive-writing/ED2976A61F5DE56B46F07A1CE9EA9F9F ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

2. Smyth, J. M. (1998). Written emotional expression: effect sizes, outcome types, and moderating variables. Journal of Consulting and Clinical Psychology. Abstract via Europe PMC: https://europepmc.org/article/MED/9489272 ↩ ↩²