gastroesophageal reflux vs gastroesophageal reflux disease

gastroesophageal reflux

noun

  • The reflux of gastric juices into the esophagus. 

  • Synonym of heartburn: pain from influx of gastric juices into the esophagus. 

gastroesophageal reflux disease

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