A hiatus hernia occurred when a portion of the stomach pushed up through the diaphragm into the chest cavity. The diaphragm, a large muscle separating the chest from the abdomen, normally had a small opening called the hiatus. Explained by the Senior Hernia Specialist for Hiatus Hernia Treatment in Mumbai. A hiatus hernia occurred when a portion of the stomach pushed up through ... https://drpradeepshriyan.in