Objective: to determine the long term risk of hysterectomy following balloon endometrial ablation. Design: retrospective cohort study. Setting: A teaching university NHS hospital(Queen Elizabeth The Queen Mother Hospital. Methods: Patients having balloon endometrial ablation were prospectively recorded in an operating room log-book between 2001 to 2016. This logbook was used to search the pathology laboratory database (Dart and Apex) to identify patients who required a hysterectomy. Results: 796 patients underwent BEA at QEQM Hospital in Margate. The patients’ age was between 25 to 60 years. A hysterectomy was subsequently performed in 166 women (20.85%). The risk of hysterectomy was higher among the 40-50 age group. The shortest time to hysterectomy was 1 year and the longest was 10 years. Conclusion: The risk of having a hysterectomy after endometrial ablation in this study was 8.7% in the first year after the ablation and this risks drop to 3.5% in 2 years after the ablation. There was 20.85% failure rate of endometrial ablation using thermachoice, and this raise the question about the effectiveness of other devices which use ballon ablation like thermablate, cavaterm and librata.