Pain in Pediatric Patients - Internet Interventions for Disorders of Gut-brain Interaction

Inclusion Criteria: * Age 8-17 years * Basic somatic work-up completed (CRP/ESR, TGA, complete blood count, fecal calprotectin) * Confirmed DGBI diagnosis: IBS, functional abdominal pain, or functional dyspepsia (according to Rome IV criteria) * Any constipation must be treated according to current clinical guidelines, with stable laxative dosing for at least one month prior to referral * In cases of celiac disease, the participant must have followed a gluten-free diet for at least six months and TGA values must have normalized * For participants with a neuropsychiatric diagnosis treated with medication, at least two months must have passed since the last dose adjustment * At least one parent and the child/adolescent must be fluent in Swedish and willing to participate in both the educational program and treatment (regardless of randomization outcome), complete homework assignments, and respond to questionnaires Exclusion Criteria: * Other organic disease that better explains the gastrointestinal symptoms * At referral assessment, psychiatric symptoms or psychosocial problems - such as severe bullying, high school absenteeism, or difficult family circumstances - are judged to be more prominent than the gastrointestinal problems and require more extensive, multiprofessional care than what the study can offer * Participants who have already completed gut-directed hypnotherapy or CBT