A large hiatal hernia is a contraindication to Orbera. The cutoff for "large" in this case is 5cm. This means that 5cm (or more) of your upper stomach is sliding above your diaphragm, which is the definition of a hiatal hernia. For patients who are seeking an Orbera balloon and have a known hiatal hernia, we will try to obtain a copy of any prior X-ray tests or endoscopy reports, so that we can determine the size. For patients without a known hernia, we perform a diagnostic endoscopy at the time of Orbera placement. This allows us to identify a hiatal hernia. It is also worth mentioning that if you have had a hiatal hernia repair (called a Nissen Fundoplication), you also cannot have an Orbera balloon, as there is an increased risk of complications.