Abstract:Objective To analyze the risk factors for intraoperative bleeding during colorectal endoscopic submucosal dissection (ESD).Methods The clinical data of 97 patients who underwent colorectal ESD at Handan First Hospital from February 2024 to February 2026 were retrospectively analyzed. According to whether visible bleeding occurred during the procedure, the patients were divided into a bleeding group (n = 21) and a non-bleeding group (n = 76). Clinical data were compared between the two groups, and multivariate logistic regression was used to analyze independent risk factors for intraoperative bleeding during colorectal ESD.Results The proportions of patients with diabetes; preoperative antiplatelet drug discontinuation for < 5 days or 5-7 days; laterally spreading or depressed lesions; submucosal invasion; and early cancer, as well as the maximum lesion diameter, were higher in the bleeding group than in the non-bleeding group (P < 0.05). Diabetes [O^R = 7.162 (95% CI: 1.169, 43.876) ], laterally spreading lesions [O^R = 6.428 (95% CI: 1.190, 34.731) ], larger maximum lesion diameter [O^R = 3.543 (95% CI: 1.730, 7.255) ], submucosal invasion [O^R = 5.452 (95% CI: 1.077, 27.612) ], and early cancer [O^R = 6.966 (95% CI: 1.384, 35.056) ] were risk factors for intraoperative bleeding during colorectal ESD (P < 0.05), whereas preoperative discontinuation of antiplatelet drugs for ≥ 7 days [O^R = 0.079 (95% CI: 0.014, 0.448) ] was a protective factor (P < 0.05).Conclusion Diabetes, laterally spreading lesions, larger maximum lesion diameter, invasion into the submucosa, and early cancer are independent risk factors for intraoperative bleeding during colorectal ESD, whereas preoperative discontinuation of antiplatelet drugs for ≥ 7 days is an independent protective factor. Patients with these risk factors should be closely monitored, and perioperative management should be strengthened to reduce the risk of intraoperative bleeding.