hernia, hiatal

hernia, hiatal Protrusion of the stomach up into the opening that is normally occupied by the esophagus in the diaphragm, the muscle that separates the chest cavity from the abdomen. A hiatal hernia can be congenital, or it can be acquired through strenuous physical activity. Hiatal hernias may contribute to gastroesophageal reflux disease with associated symptoms. Treatment involves lifestyle modifications, medications, and in some cases, surgery. Also known as hiatus hernia. See also gastroesophageal reflux disease.