high and low acidity of the stomach

abdomen acid acidity belly bowel brash cancer colon contents cure digestion digestive disorder egd esophageal esophagus fibrogastroduodenoscopy flatulence flatulency gastric gastroenterology gullet gut healing heartburn helicobacter human hyperacidity hyperoxemia hypoacidity indigestion intestinal intestine juices medical medication medicine meteorism oesophagus oncology pain pylori pyrosis reflux stomach therapy treatment ulcer upset