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The rapid expansion of keyhole surgery to encompass weight loss procedures and its gradual development over many years means that surgery is now generally very safe. With any surgery there are general, albeit rare, complications such as bleeding, infection and clot formation in the legs or clots travelling to the lungs. Gastric balloons may very rarely rupture, bands may slip, erode or require tube changes due to infection or leakage. Sleeve and bypass operations may rarely be complicated by leakage. For a more detailed summary, please review the NBSR report which highlights the outcomes following surgery in the UK.