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Background Interoception describes the inner sense of the body, and relates to sensing, interpretation and regulation of internal signals. Investigation of interoception and subject beliefs has recently been tested with a new approach of cardiac interoception by Legrand et al. Aberrant interoceptive abilities are suggested to play a role in development and maintenance of functional somatic disorders (FSD). Studies on adults with specific types of FSD such as functional neurological disorder and fibromyalgia syndrome have found that these patients have lower or impaired cardiac interoception compared to healthy controls. In contrast, a study on patients with somatoform disorders found no evidence for differences in cardiac interoception for these patients compared to healthy controls. However, the research within functional gastrointestinal disorders (FGID) is sparse, and our knowledge about the role of interoception in children and adolescents with this subtype of FSD even more limited. Aim The primary aim of this project is to investigate if interoception is altered in children and adolescents with FGID compared to healthy controls, using a psychophysical measure of cardiac interoception, i.e. the heart rate discrimination (HRD) task.