Hiatus Hernia By Kristle Lee Lynch, MD, Perelman School of Medicine at The University of Pennsylvania Reviewed / Revised Mar 2022 | Modified Sep 2022 View Patient Education Etiology Pathophysiology Symptoms and Signs Diagnosis Treatment Topic Resources Understanding hiatus hernia Barium Swallow Showing Sliding... Hiatus Hernia Hiatus hernia is a protrusion of the stomach through the diaphragmatic hiatus.