When we feel heartburn, acid reflux or belching on a regular basis, it is usually caused by gastroesophageal reflux. Would you be surprised if chronic cough, asthma, pneumonia, interstitial lung fibrosis, chronic bronchitis, etc. could also be caused by stomach disorders? People with long-term lung disease do not notice the relationship between the lungs and the stomach, and certain lung diseases can exacerbate GERD. “Asthma attacks may be caused by direct irritation of the bronchial mucosa or indirectly due to gastric reflux.” These asthmatic patients have GERD, but the presence of GERD is overlooked by internists because heartburn and acid reflux are not obvious. Effective treatment of gastroesophageal reflux in clinical practice often results in significant improvement or even complete relief of symptoms of pulmonary disease. In addition, foreign scholars have studied the results of gastroesophageal barium meal examinations in patients with unexplained pulmonary fibrosis and confirmed a high incidence of esophageal hiatal hernia and gastroesophageal reflux. Gastric acid aspiration from a small amount of tracheobronchus over a long period of time repeatedly may lead to interstitial pulmonary fibrosis. It should be noted that the incidence of gastroesophageal reflux disease is increasing year by year and we should not take this disease lightly because esophageal cells stimulated by gastric acid for a long time may become cancerous; foreign studies have found that people with symptoms such as stomach pain, heartburn or acid reflux once a week are nearly 8 times more likely to develop adenocarcinoma of the esophagus than the general population.