ICBT for Pain-predominant FGIDs in Children and Adolescents: an Implementation Study.

Inclusion Criteria: * Age 8-17 at date of inclusion. * Fulfilling Rome IV-criteria for irritable bowel syndrome, functional dyspepsia or functional abdominal pain with a written statement from patient's physician confirming a diagnosis. * Stable psychotropic medication for at least 1 month. Exclusion Criteria: * concurrent serious medical conditions. * a psychiatric diagnosis, judged to be a more important treatment target than the abdominal pain. * on-going structured psychological treatment. * absence from school exceeding an average of 2 days a week the last month is a cause for exclusion since high school absence demands more intensive interventions than can be offered in ICBT. * on-going abuse or severe parental psychiatric illness in the family. * since treatment format assumes normal reading and writing skills, pronounced language skill deficits and learning difficulties lead to exclusion from the study. * lack of regular internet-access.