Efficacy of Guided Imagery Therapy Mobile Application for Functional Abdominal Pain

After fully disclosing the study design, intervention options, randomization scheme, and potential side effects of the interventions, caregivers and their children will document their respective informed consent and assent electronically. REDCap is a secure web application designed for surveys and databases. All data captured through REDCap will be encrypted and transmitted securely to HIPAA-compliant institutional servers for storage. Participants and their caregivers will complete the following surveys at baseline, second baseline phase (delayed treatment group only 8 weeks after baseline), and immediately post-therapy (delayed treatment group 16 weeks after baseline and immediate treatment group 8 weeks after baseline) through REDCap: * 2-week Abdominal Pain and Stooling Diary * Children's Somatic Symptoms Inventory (child self-report and parent proxy-report) * Pain Catastrophizing Scale - Child Version * Pain Catastrophizing Scale - Parent Version * Pediatric Quality of Life Inventory 4.0 Generic Core (child self-report and parent proxy-report) * Behavior Assessment System for Children 3rd Ed (child self-report and parent proxy-report)