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Revisional bariatric surgery is a tailored surgical approach performed when a prior bariatric procedure fails to deliver expected weight loss, the patient regains weight, or procedure?related complications arise. Reasons for revision include inadequate initial weight loss, weight recidivism, mechanical issues (for example slipped or eroded bands), severe gastroesophageal reflux, strictures, malnutrition from over?malabsorptive operations, or device failure. Revision strategies include modifying the original operation, converting one procedure to another (for example, converting adjustable gastric banding to sleeve gastrectomy or Roux?en?Y gastric bypass), or, in rare cases, reversing a prior procedure to treat severe complications.

Most revisions are performed laparoscopically, though complex cases may require open or robotic approaches; these procedures carry a higher technical difficulty and a greater complication risk than primary bariatric surgery, so they are best managed in specialized multidisciplinary centers. Outcomes can be good: patients who convert to definitive procedures often achieve comparable weight loss and improvement in obesity?related comorbidities as primary surgery patients