Stomach pain, nausea, acidity and vomiting may be due to reflux esophagitis, gastritis, gastric ulcer and other lesions and symptoms. 1. reflux esophagitis: this kind of disease can appear reflux, heartburn, burning sensation under the sternum and other symptoms, mostly due to gastric acid reflux, gastric mucous membrane damage and symptoms, this kind of people can be treated by taking omeprazole and other acid inhibitors, domperidone and other gastric motivation drugs. 2. Gastritis: this kind of people can also have acid reflux, nausea and vomiting, gastric distension, stomach pain and other phenomena, which can be treated by taking acid-suppressing drugs such as omeprazole and gastric mucosa-protecting drugs such as bismuth potassium citrate. 3. Gastric ulcer: due to the increased secretion of gastric acid, this kind of people can also have the phenomenon of acid flow, nausea and vomiting, which can cause the phenomenon of stomach pain, stomach distension, and so on, and can be treated by taking acid-suppressing drugs such as omeprazole and other acid-suppressing drugs. The above medications need to be applied under the advice of a doctor, and timely consultation is recommended.