Reflux is a term meaning "to flow backwards" or "to return".
In chemistry, is a distillation technique involving the condensation of vapors and the return of this condensate to the system from which it originated.
Reflux may also refer to:
Duodenogastric reflux or biliary reflux Acid indigestion, cardialgia or pyrosis, all synonyms for heartburn Acid reflux disease, gastric reflux disease or gastro-oesophageal reflux disease (GORD), all synonyms for gastroesophageal reflux disease (GERD) Atypical reflux, extraesophageal reflux disease (EERD), supraesophageal reflux or supra-esophageal reflux, all synonyms for laryngopharyngeal reflux (LPR) Vesicoureteral reflux (VUR) Superficial venous reflux, see Chronic venous insufficiency