New research published in PLOS One suggests that childhood trauma can limit the benefits of mindfulness meditation programs for people experiencing active depression and may increase the risk of adverse effects.
Mindfulness-Based Cognitive Therapy (MBCT) combines meditation with cognitive therapy techniques and was originally developed to prevent depression relapse in recovered patients. Over time, MBCT and similar programs have also been used to treat active depression. While many participants report improvements, researchers have observed that responses vary widely.
Previous studies indicated that childhood trauma could influence the effectiveness of mindfulness programs. Trauma survivors sometimes benefit more from MBCT when it is used for relapse prevention. However, when treating active depression, the results are less consistent. Some participants with trauma histories struggle to improve, and meditation-related side effects—such as anxiety, panic, or resurfacing traumatic memories—have been reported.
To explore this issue, a research team at Brown University conducted two clinical trials under the leadership of Nicholas K. Canby. The first trial involved 52 participants (average age 47, 79% female), while the second included 104 participants (average age 40, 74% female). All participants showed symptoms of depression, and some had past or subclinical post-traumatic stress disorder (PTSD).
In the first study, participants were randomly assigned to MBCT or a waitlist control group. The second study compared standard MBCT with focused attention meditation and open monitoring practices. “The MBCT module followed the standard session-by-session manual, while the [focused attention meditation] and [open monitoring practices] curriculums emphasized specific forms of meditation present in standard MBCT,” the researchers explained.
Depression symptoms were measured before and after treatment, dropout rates were tracked, and participants reported any unexpected or unpleasant experiences during meditation.
Across both studies, childhood trauma predicted poorer outcomes. Childhood sexual abuse emerged as a particularly strong predictor of poor depression outcomes and was linked to higher dropout rates in the larger second trial. Emotional neglect and emotional abuse were also associated with smaller improvements in depression symptoms.
Participants with trauma histories were more likely to report meditation-related side effects, including vivid imagery, heightened anxiety, dissociation, and emotional blunting. Some described feeling trapped or overwhelmed during body-focused meditation, which triggered memories of past abuse.
The study concludes, “Childhood trauma predicts poorer outcomes in MBCT treatment for active depression yet better outcomes when MBCT is used as a relapse prevention program in remitted individuals who are not currently depressed.”
The researchers emphasize that meditation is not inherently harmful. However, trauma survivors may benefit from additional support or program modifications, such as shorter sessions, smaller groups, or trauma-informed guidance.
The study has limitations. Most participants were female, white, and highly educated, which may limit the generalizability of the findings. Additionally, one trial lacked a non-meditation control group, making it harder to determine whether the negative outcomes were specific to mindfulness or reflected broader treatment challenges.
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