Does Journaling Help Mental Health? What the Research Says

Journaling can help some people with their mental health, but the effects found in research are small to moderate and not the same for everyone. A 2022 systematic review of 20 randomised trials found a modest benefit for symptoms of anxiety, depression and PTSD, with a lot of variation between studies. Most of that research tested structured expressive writing, not everyday diaries. So journaling is best seen as a low-risk support alongside other care, not a treatment on its own.

What the research actually studied

Almost all of the best-known research is on expressive writing, a specific method developed by psychologist James Pennebaker. In a typical study, people write about an upsetting or emotional experience for about 15 to 20 minutes, on three to five sessions, often on consecutive days. Control groups write about neutral topics, such as describing their room or their daily schedule.

Baikie and Wilhelm, in a 2005 review in Advances in Psychiatric Treatment, describe this paradigm, which goes back to a 1986 study in which students wrote about the most upsetting experiences of their lives for 15 minutes across four days.

This matters because a daily diary is a different thing. Most people who journal write freely, in their own time, about whatever is on their mind, often with no end point. That can be useful, but the studies below do not tell us the same thing about it. When you read that "journaling helps," check what was actually tested.

What the evidence says on mental health

Overall effects are small to moderate

• Frattaroli (2006). In a meta-analysis of 146 randomised studies in Psychological Bulletin, Joanne Frattaroli reported a positive and statistically significant average effect, but a small one (r = .075).
• Baikie and Wilhelm (2005). Their review reported a moderate overall effect in healthy participants (d = 0.47, from 13 studies) and a smaller one in clinical populations (d = 0.19, from nine studies). It also noted that psychological benefits were less consistent than some of the physical-health findings.
• A 2022 systematic review and meta-analysis. A team publishing in Family Medicine and Community Health searched three databases and included 20 trials covering PTSD, other anxiety disorders and depression. It found a small to moderate benefit for journaling compared with control conditions. The authors also reported high heterogeneity, meaning results varied a lot between studies, and flaws in some of the trials. They graded the evidence B on the Strength of Recommendation Taxonomy, which they describe as inconsistent or limited-quality evidence.

The authors of that 2022 review suggested journaling might be considered as an adjunct to current evidence-based treatment, citing low risk of adverse effects, low resource needs and its focus on self-efficacy. In plain terms: it is cheap and fairly safe to try, and it may add something, but it is not a replacement for therapy or medication.

Results are inconsistent

Expressive writing research has a replication problem. In a 2023 paper in Frontiers in Psychology, Rude and colleagues describe the literature as hard to replicate, with outcomes that vary from study to study. They note that some meta-analyses found small effects while others found none for depression, and that the reasons behind these differences are not fully explained. In their own study of depression symptoms, traditional expressive writing did not differ from the control condition.

So the honest summary is that average effects are real but small, and your individual result could be a clear benefit, no change, or occasionally a worse day.

Who it may not help

The research also has clear warnings:

• Short-term mood often dips. Baikie and Wilhelm note that expressive writing typically causes an immediate increase in negative mood and physical symptoms. In general this has not been shown to cause longer-term harm, but it is a reminder that writing about hard things can feel hard.
• Some groups did not benefit. The same review reports no advantage over control writing for some groups, including bereaved people and students screened for suicidality. It also notes that writing was detrimental for adult survivors of childhood abuse and for a small group of Vietnam veterans with PTSD.
• Timing may matter. A 2020 randomised trial in Frontiers in Psychology, by Vukčević Marković and colleagues, gave 120 adults in Serbia five 20-minute expressive writing sessions during the COVID-19 pandemic. Distress did not fall, and stress scores were higher in the writing group after the sessions. There were no group differences at one-month follow-up. The authors suggest writing during an ongoing stressor may be harmful, although about two-thirds of the writing group still found it personally beneficial, and the trial was small.
• It is not established for anxiety on its own. The Oncology Nursing Society's clinical page on expressive writing for anxiety rates the evidence as "Effectiveness Not Established" and says the approach "may have relevance" for anxiety, rather than claiming it works.

Baikie and Wilhelm advise using expressive writing with caution in clinical settings, as an adjunct and not a replacement for standard treatment, and suggest people should be able to stop at any time.

What this means for everyday journaling

Here is the careful reading of the evidence:

1. Writing about emotions seems to help some people a little, on average. That is a modest claim, and it is the one the research supports.
2. Most of the proof is for a structured task. A short, focused writing task is not the same as an open-ended diary kept for years.
3. We do not know much about free journaling. Research on casual, long-term journaling is thinner, so claims that it "rewires" the brain or cures anxiety go beyond what the sources show.
4. Benefit is not guaranteed. Some people feel worse after writing, and for certain topics and times, writing may not be the right tool.

If you already enjoy journaling, nothing here says to stop. If you feel stuck after a session, that is useful information about how you are using it, not a personal failure. Our mental health journal page explains what a journal designed for this purpose can look like.

How to journal in an evidence-informed way

You cannot copy a lab protocol exactly, but you can borrow what the studies tend to share while staying honest about what is still uncertain.

Keep sessions short and bounded

Studies typically use 15 to 20 minutes. Set a timer, write, and stop when it rings, even if there is more to say. Having an end point protects you from spiralling and makes the habit easier to keep.

Write about what you feel, not only what happened

Expressive writing is about emotions and meaning, not only a log of events. Try to name the feeling, what it connects to, and what you make of it. If you do not know where to start, a few journal prompts can get you going.

Pick something you can handle today

The studies are not an instruction to dig into your worst memory. If a topic feels too heavy, choose something smaller, write around it, or leave it for a time when you have support. You can stop at any point.

Notice if you are going in circles

Writing the same worry in the same words every day may keep you stuck rather than help. If your entries keep repeating, shift to a question, such as "what is one thing I can do about this?" or "what would I say to a friend?" Our guide on how to stop overthinking with journaling has specific ways to do this.

Close the session gently

After a hard entry, do something calming or practical: a short walk, a drink of water, a message to someone you trust. Because mood often dips right after writing, a small buffer is sensible.

Use it as a supplement

If you are in therapy, journaling can be a good place to collect what you want to talk about. If you are not, it can help you understand patterns before deciding whether to seek help. Either way it sits alongside other care.

Try variety

If you are new to this, journal prompts for beginners are an easy starting point. If you are curious about deeper reflection, shadow work journal prompts can be useful, but go gently with them, since they ask you to look at difficult parts of yourself.

When to get support

Journaling is not a substitute for professional care. If you are struggling with low mood, anxiety, trauma memories, thoughts of harming yourself, or anything that feels too big to manage alone, please contact a licensed mental health professional. If you are in immediate danger or think you might act on thoughts of self-harm, contact your local emergency services or a crisis line in your country right away. If writing about a topic leaves you more distressed, stop and reach out to someone you trust or a professional before continuing.

Sources and further reading

• Emotional and physical health benefits of expressive writing (Baikie and Wilhelm, 2005) - describes the Pennebaker method, effect sizes, short-term mood dips and groups who did not benefit.
• Experimental Disclosure and Its Moderators: A Meta-Analysis (Frattaroli, 2006) - a 146-study meta-analysis finding a small but significant average effect.
• Efficacy of journaling in the management of mental illness: a systematic review and meta-analysis (2022) - 20 trials in PTSD, anxiety and depression with modest benefit and high heterogeneity.
• Chasing elusive expressive writing effects (Rude et al., 2023) - explains why results across expressive writing studies are inconsistent.
• Effectiveness of Expressive Writing in the Reduction of Psychological Distress During the COVID-19 Pandemic (Vukčević Marković et al., 2020) - a randomised trial where writing during an ongoing stressor did not reduce distress.
• Expressive Writing/Emotional Disclosure/Journaling for Anxiety (Oncology Nursing Society) - rates effectiveness for anxiety as not established.

Where Symplia fits

Symplia is a private mental health app for journaling, mood check-ins and reflection, with prompts, a Voice Journal and AI-assisted insights that help you notice recurring themes. It is not therapy and does not diagnose anything, but it can give you a simple place to write in short sessions, see patterns over time and bring what you notice to a therapist if you have one.

Try Symplia free at app.symplia.app. Monthly and Annual plans include a 7-day free trial.

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