I believe many of you have no idea what hiatal hernia is. So, before I answer the question, I think I will explain the term first.
When you have hiatal hernia, a small part of the stomach pushes through a hole in the diaphragm. The hole is named a hiatus. It's supposed to be there and allows the esophagus to connect to the stomach. However, when there's weakness in the diaphragm, the stomach acid can easily move up into the esophagus, thus causing acid reflux.
Usually, some natural factors prevent stomach acid from entering the esophagus, but they can be disrupted when a person develops hiatal hernia. So acid reflux is deemed to be one of the symptoms of a developed hiatal hernia.
Keyword: hiatal hernia acid reflux