acid reflux vs gastro-oesophageal reflux

acid reflux

noun

  • Reflux of stomach acid into the esophagus. 

  • Heartburn, especially recurring or chronic heartburn. 

gastro-oesophageal reflux

How often have the words acid reflux and gastro-oesophageal reflux occurred in a corpus of books? (source: Google Ngram Viewer )