Abstract:Objective To investigate the diagnostic value of endoscopy in pediatric chronic diarrhea and provide evidence for early diagnosis and treatment.Methods Clinical data from 130 pediatric patients hospitalized in the Department of Gastroenterology in our hospital between January 2017 and June 2024 were analyzed. Etiologies and findings were summarized from electronic gastroscopy/colonoscopy, mucosal biopsy, and capsule endoscopy.Results All 130 children completed electronic gastroenteroscopy or capsule endoscopy examinations,the overall lesion detection rate was 93.1%. Electronic gastroscopy was performed in 73 cases, revealing lesions in 65 cases (detection rate: 89.0%). Capsule endoscopy was conducted in 7 cases, with mucosal lesions detected in 5 cases. Of the 125 patients who underwent electronic colonoscopy, mucosal lesions were detected in 94 cases, yielding a detection rate of 75.2%. Pathological examination of colonic specimens was performed in 90 cases. Primary pathological findings included-mucosal inflammation was in 38 cases (42.2%), intestinal mucosal erosion was in 10 cases (11.1%), lymphoid follicular hyperplasia was in 14 cases (15.6%), eosinophilic infiltration was in 3 cases (3.3%), features suggestive of inflammatory bowel disease were in 10 cases (11.1%),chronic active inflammation with cryptitis/ crypt abscesses was in 14 cases (15.6%) and one case of juvenile polyp (1.1%).Conclusion The etiology of chronic diarrhea in children is complex. Combining endoscopy with mucosal pathology aids in definitive diagnosis, particularly for inflammatory bowel disease and allergic enteritis. It is recommended to actively promote the application of pediatric digestive endoscopy technology based on strict adherence to indications, with particular emphasis on multi-site biopsies and the rational use of capsule endoscopy.