Can expressive writing improve mental and physical health?

What is expressive writing and how is it supposed to help?

Expressive writing is a simple, self-guided practice where you write about your deepest thoughts and feelings about a stressful or emotional experience for 15–20 minutes a day, usually for 3–4 consecutive days. The idea is that putting difficult experiences into words helps you process them, reduce emotional distress, and even improve physical health by lowering stress-related inflammation and improving immune function.

Researchers have tested this in many groups, from cancer patients to new mothers to people with everyday stress. The results show it can be powerful — but not for everyone, and not in every situation.

Where does expressive writing work best? Cancer patients and people facing major medical stress

The strongest evidence comes from studies of people dealing with serious medical conditions. In a 2025 randomized trial of 90 women undergoing fertility treatment, those who did expressive writing had significantly greater reductions in depression and stress compared to a control group (p = 0.001 and p = 0.011, respectively) [1]. The writing group was the only one that showed a meaningful drop in depression scores over the course of treatment [1].

Another 2025 study of 82 ovarian cancer patients found that expressive writing focused on positive emotions led to large improvements: anxiety scores dropped from 45 to 38 (a 16% reduction) and depression scores from 49 to 42 (a 14% reduction) compared to routine care [2]. The writing group also showed significantly more post-traumatic growth — meaning they found new meaning or strength from their experience [2].

A 2024 feasibility study of breast cancer caregivers and patients found that expressive writing had small-to-large effects on patient health (effect sizes from -0.28 to 0.86) and moderately reduced emotional suppression (a coping style linked to worse health) [3]. These effects were still present three months after the writing sessions ended [3].

Why doesn't it work for everyone? The limits of expressive writing

Despite the promising results in specific groups, larger and more general studies have found little to no benefit. A 2019 randomized trial of 564 new mothers found that expressive writing did not improve physical health, anxiety, depression, mood, or quality of life at 1 or 6 months compared to a control writing task or normal care [6]. The researchers noted that uptake and adherence were low, and concluded that expressive writing is not effective as a universal intervention for all women after childbirth [6].

A 2017 meta-analysis of 16 randomized trials in cancer patients found no statistically significant effect of expressive writing on psychological health, physical health, or quality of life overall [4]. However, the same analysis found that people who had low emotional support — those who felt they couldn't talk openly about their illness — did seem to benefit more [4]. This suggests that expressive writing may work best as a substitute for social support when that support is lacking.

A 2022 study of 100 healthy adults found that writing about imagined future events (called 'rehearsal' writing) had different effects than writing about past events: it reduced behavioral disengagement (giving up) and increased emotional venting, but did not significantly change overall mental health scores [5]. This suggests the type of writing matters, and that the standard 'write about your deepest feelings' approach may not be optimal for everyone.

So, should you try expressive writing?

If you are going through a major health challenge like cancer treatment or fertility struggles, the evidence suggests expressive writing can meaningfully reduce anxiety, depression, and stress [1][2]. It is free, private, and has no known side effects, so it is worth trying as a complement to medical care.

If you are generally healthy or dealing with everyday stress, the evidence is weaker. You might still find it helpful — many people do — but don't expect dramatic results. The research suggests it may be most useful when you feel you cannot talk openly about your experiences with others [4].

A practical tip from the studies: focus on positive emotions or future possibilities, not just replaying negative events. The 2025 ovarian cancer study used prompts like 'write about the positive aspects of your experience' and got strong results [2]. The 2022 study found that writing about imagined future interactions (rehearsal) reduced giving-up behaviors more than writing about past events [5].

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