From my understanding of it, Reflux is where the stomach acids travel back up the osopheagus (sp?) and just sits there in the back of your throat. Indigestion/heartburn is the really bad pain in your chest, right between your boobs. Sometimes for me it is like I am being stabbed in the back with a hot poker when it is really bad. Often if I eat something that is strong smelling/tasting I will have it repeat on me - when I burp I can taste it *yuck*, usually stuff like onions and fish.