The purpose of this pilot feasibility study is to evaluate the effects of a smartphone-based mindfulness intervention (MBI) on pain-related outcomes in individuals with fibromyalgia. This 8-week randomized controlled trial will compare an MBI app group to a control group who completes assessments only through the app.

The MBI intervention includes weekly video content focused on mindfulness practice and psychoeducation, combined with daily symptom tracking through the app. Participants in both groups will complete self-report measures at baseline, post-intervention, and follow-ups at 3 and 6 months.

The study will enroll up to 100 participants from Brigham and Women's Hospital and the greater Boston area. This pilot study is designed to assess feasibility and explore preliminary effects on outcomes such as pain interference, fibromyalgia symptoms, pain catastrophizing, sleep disturbance, emotional distress, mindfulness, and pain acceptance. Results will be used to inform the design of a future fully powered randomized trial.

Mindfulness-based interventions have shown promise in improving symptoms of chronic pain, including fibromyalgia, through mechanisms such as increased pain acceptance, reduced catastrophizing, and enhanced emotional regulation. Delivering such interventions via smartphone application increases accessibility and scalability, particularly for individuals who face mobility or geographic barriers to in-person treatment.

This study uses a parallel-group randomized controlled design. Participants will be assigned to either the MBI intervention group or a control group. The intervention group will receive access to weekly mindfulness practice and psychoeducation videos through a smartphone app over the course of 8 weeks, in addition to daily symptom tracking and weekly assessments. The control group will use the same app to complete assessments only.

Primary outcomes include feasibility and clinical variables including pain interference, fibromyalgia symptoms, and pain catastrophizing. Secondary outcomes include sleep disturbance, anxiety, depression, pain acceptance, and mindfulness.

Assessments will be collected at baseline and after the 8-week intervention, with additional follow-ups at 3 and 6 months post-intervention to examine sustained effects. All study procedures, including informed consent, intervention delivery, and assessments, will occur remotely through the app or secure platforms.

The results of this study will offer insight into the acceptability, engagement, and preliminary efficacy of smartphone-based mindfulness interventions for fibromyalgia and guide development of a larger confirmatory trial.

Inclusion Criteria:

• Adults aged 18 to 65
• Diagnosis of fibromyalgia per Wolfe et al. (2011) criteria
• Stable medication regimen or medication-free
• Fluent in English
• Able to provide informed consent

Exclusion Criteria:

• Comorbid pain condition more severe than fibromyalgia
• Pregnancy or breastfeeding
• Current psychosis or history of severe psychiatric illness
• Active suicidal ideation
• Participation in another therapeutic trial
• Any condition that may interfere with study compliance as judged by the PI or study coordinator