Flatulence is caused by delayed gastric emptying and pressure of food on the stomach lining. Excessive fermentation of food in the stomach produces gas and further increases the pressure. Common causes include gastritis, peptic ulcer, dietary and mental factors. 1. Gastritis: Gastritis includes stress gastritis, Helicobacter pylori-related gastritis, and autoimmune gastritis. There are three processes of pathological changes, namely epithelial damage, mucosal inflammatory response and epithelial regeneration. Generally, gastric mucosal protection drugs such as colloidal bismuth subcitrate, etc., adjusting gastrointestinal motor function drugs such as domperidone, etc., H2 antagonist acid suppression such as omeprazole, two antibiotics amoxicillin and clarithromycin. 2. Peptic ulcer: can be in the esophagus, stomach or duodenum. Can also be near the stomach – jejunum anastomosis or Meckel diverticulum. Generally, endoscopy and X-ray can be used for diagnosis, and omeprazole and bismuth pectin can be taken. 3. Dietary and mental factors: If you eat too little fiber-containing food, eat too much easily flatulence food such as radish, soybean, rice cakes, etc., may also cause flatulence and indigestion. Flatulence may also be caused if there are symptoms of stress such as mental worry and anxiety. You need to eat easy-to-digest foods with lots of fiber and regulate your mood. If you have flatulence, you need to seek medical treatment as soon as possible and take medication as prescribed by your doctor.