acid reflux vs gastroœsophageal reflux disease

acid reflux

noun

  • Reflux of stomach acid into the esophagus. 

  • Heartburn, especially recurring or chronic heartburn. 

gastroœsophageal reflux disease

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