[Acid Reflux Self-Test] The official name of acid reflux is gastroesophageal reflux disease. Originally, the lower esophageal sphincter, which connects the esophagus and the stomach, prevents food and acid in the stomach from flowing back into the esophagus and mouth. However, in patients with acid reflux, this group of muscles often relaxes, causing gastric acid to flow back into the esophagus. Based on your symptoms in the past seven days, try to see if you have the following 6 symptoms?