It looks like lots of people confuse what is Hiatus and what is Hiatal Hernia. Hiatus is translated from Latin as hole and in medicine it means a hole in diaphragm. When part of stomach moves through this hole it is called Hiatal Hernia (because it moves through Hiatus).

You can find much more information about Hiatus Hernia (oops… Hiatal Hernia!)¬†at http://www.manageyourheartburn.com/hiatal-hernia-relief.php