Antireflux surgery are operations to treat gastro-oesophageal reflux disease (GORD). GORD is a common condition due to reflux of acid from the stomach into the oesophagus. Symptoms are variable, from asymptomatic, to relatively minor and controlled by lifestyle changes or medication, to severe and unresponsive to medication. Patients with GORD sometimes also have a hiatus hernia, which is when part of the top of the stomach slips up into the chest due to a widened weakness in the diaphragm (the "hiatus"). Antireflux surgery usually involves fixing the hiatus hernia and performing a fundoplication, where a floppy part of the stomach is used to form a "wrap" around the oesophagus, reducing acid reflux. These operations are often done laparoscopically ("key hole").