Endoscopy plays an important role in the operative planning prior to any surgical interventions in the upper gastrointestinal tract. However, endoscopic techniques can also provide extremely useful information in the evaluation and management of postoperative upper gastrointestinal symptoms and complications following foregut surgery, including antireflux and bariatric procedures. Commonly encountered symptoms include abdominal pain, nausea, emesis, and dysphagia, while weight regain, heartburn, regurgitation, hematemesis, and melena are less common.