Acid reflux: the cause of the symptom of heartburn the stomach is protected against strong acid , but the gullet ( oesophagus ) is not so when acid regurgitates upwards into the oesophagus, there is a burning pain in the centre of the lower part of the chest acid reflux commonly occurs in hiatus hernia. Meaning of acid reflux. Reflux definition, a flowing back; ebb see more.
meaning of acid reflux
