Acid reflux is a reflux of acid from the stomach into the mouth without nausea, vomiting or force. There are many reasons for acid reflux: 1. decrease in gastric mucosal anti-reflux system caused by food, clothing, irregular diet, alcohol and tobacco stimulation; 2. decrease in absorption due to unscientific dietary structure and poor eating habits, so that gastric acid cannot be drained immediately; 3. increase in gastric acid due to fast pace of food, clothing, housing and exercise, and decrease in intestinal peristalsis of the digestive tract; 4. extremely rare tumors It can stimulate the gastric mucosal body cells to increase the metabolism of gastric acid, and gastric acid reflux occurs, and acid reflux occurs due to excessive secretion of gastric acid stimulating the gastric mucosa, such as reflux gastritis. 5. The relaxation of the esophageal cardia sphincter causes a decrease in pressure, which easily leads to the reflux of liquid and food in the stomach into the esophagus.