by Dr. Thomas K. Lo, Advanced Chiropractic Gastroesophageal reflux (GER) happens when your stomach contents come back up into your esophagus. Stomach acid that touches the lining of your esophagus can cause heartburn. Doctors also refer to GER as acid indigestion, acid reflux, acid regurgitation, heartburn, and reflux.   Gastroesophageal reflux disease (GERD) is a more…