Abstract
Background: More than two-thirds of patients with functional gastrointestinal disorders (FGIDs) experience various degrees of mental health issues. Although studies indicate that FGIDs are related to depressive symptoms, sleep disorders, and somatic symptoms, the underlying mechanism between these variables remains unknown. Our objective was to establish a model that outlines the interactions between these psychological dimensions in FGIDs and, thus, provide valuable insights into how to enhance the well-being of affected individuals. Methods: This study used the convenient sampling method to enroll patients who visited the digestive internal medicine department. A total of 238 patients were investigated using the Rome IV criteria (irritable bowel syndrome used Rome Ⅲ criteria). A questionnaire including the Hospital Anxiety and Depressive Symptoms Scale, the Pittsburgh Sleep Quality Index, and the Patient Health Questionnaire-12 was used. The chain mediating roles of sleep disorders and somatic symptoms in the relationship between depressive symptoms and FGIDs were examined by the bootstrap method. Results: Correlation analysis revealed that depressive symptoms were positively related to sleep disorders, somatic symptoms, and FGIDs. Sleep disorders were positively related to somatic symptoms and FGIDs. Somatic symptoms were positively related to FGIDs. Chain mediating effect analysis showed that depressive symptoms can not only affect FGIDs but also through three indirect paths, as follows: the mediating role of sleep disorders and somatic symptoms, the chain mediating roles of sleep disorders and somatic symptoms, and the mediating effect size accounted for 7.2%, 7.7%, and 2.5% of the total effect, respectively. Conclusions: This study is conducive to understanding the internal mechanism underlying the relationship between depressive symptoms and FGIDs. It reminds us that when treating FGIDs patients, we should not only provide adequate psychological support to improve but also pay attention to improvements in their sleep quality and somatic symptoms.