Forest bathing for fatigue and sleep after cancer

Evidence label: Promising but low-certainty supportive-care evidence · Clinical goal: reduce fatigue, distress or sleep difficulty after cancer

Evidence at a glance

A controlled eight-session program in 75 cancer survivors reported improvements in fatigue, distress, quality of life and walking performance, but the study was small and difficult to blind.
A 29-person single-group program reported lower insomnia scores after eight weekly two-hour sessions; without a control group, attention, expectation and recovery over time cannot be separated from the intervention.
A short forest visit may support wellbeing for some people. It has not been shown to control tumors, prevent recurrence or prolong survival.

What was studied

Programs described as forest therapy or forest bathing combine slow walking, sensory attention, breathing, guided reflection and time in a wooded environment. Because these elements travel together, studies do not identify which component matters.

The controlled survivor study enrolled 75 participants in an eight-session program and reported favorable time-by-group patterns across several symptom and function measures. The sleep pilot enrolled 29 people in eight weekly two-hour sessions and reported a fall in mean Insomnia Severity Index scores from 14.8 to 8.1 after the program and 9.1 at follow-up.

Limits and uncertainty

Small samples, self-reported outcomes, nonblinded comparisons and combined interventions increase expectancy and selection bias. The sleep study had no comparison group. Environmental access, weather, mobility, allergies and cultural comfort affect generalizability. A 2026 Taiwanese single-group study of a two-hour session assessed immediate mood and physiologic changes, not durable cancer outcomes.

Safety and practical context

Potential concerns include falls, heat or cold exposure, pollen, insects, infection risk during profound neutropenia and unsafe terrain. A park, garden or indoor nature-based alternative may be more realistic than remote woods. Follow oncology guidance about crowds, wounds, central lines and immune suppression.

Bottom line

Forest-based programs may be a reasonable optional layer of supportive care when accessible and safe, but the evidence remains preliminary. Symptom improvement is not evidence of anticancer activity.

Questions for the care team

Are my blood counts, balance and mobility compatible with the planned terrain and exposure?
Which outcome—sleep, fatigue, mood or activity—will we track to decide whether this is worthwhile?
Is there an accessible local or indoor alternative if outdoor exposure is unsafe?

Sources

Literature searched: October 23, 2026 · Record appraised: October 23, 2026

Educational evidence summary, not personal medical advice. Research regimens describe what was studied; they are not personal prescribing instructions and should not replace cancer treatment or individualized supportive care.

Related Missing Script review

Forest Bathing for Cancer Fatigue and Sleep: Promising, but Still Preliminary