tObjectives: To study the impact of malnutrition on a population treated for Zenker’s diverticulum and tolook for the causes of persistence or recurrence of dysphagia after endoscopic surgery.Material and methods: This retrospective study included 30 patients with Zenker’s diverticulum treated byendoscopy. All swallowing disorders and manifestations of malnutrition and postoperative improvementin and/or recurrence of symptoms were noted.Results: Nutritional status was evaluated for 26 patients. Before surgery, 54% suffered from malnutrition,which was severe in 31%; 28.6% of the cases with malnutrition showed postoperative complications,versus 8.3% of cases without baseline malnutrition. Ninety percent of patients (n = 27) declared completeresolution of symptoms. Nine patients presented recurrence of dysphagia, including 6 with recurrenceof Zenker’s diverticulum and 3 with, respectively, inclusion body myopathy, esophageal hypertonia andcentral disease.Conclusion: Malnutrition should be quantified and treated before and after surgery for Zenker’s divertic-ulum to prevent complications and decrease mortality. Associated pathologies should be systematicallyscreened for, especially in case of recurrence of swallowing disorder without recurrence of Zenker’sdiverticulum