gastroesophageal reflux disease. gerd

abdomen acid anatomy bad belching body breath burn burping care digestion digestive disease disorder duodenum esophageal esophagitis esophagus flatulence gastric gastritis gastroenterology gastroesophageal gerd health healthy heartburn human icon illness illustration indigestion mechanism medical medicine oesophagus organ pain problem reflux science sick sickness sphincter stomach surgery symbol symptoms system ulcer valve