Esophagitis causes the appearance of cough but no sputum. Esophagitis is caused by excessive secretion of gastric acid, which refluxes into the pharynx and irritates the cough, which is a dry cough without the appearance of sputum. The appearance of sputum means that the patient’s airway has secretions, while esophagitis and airway are two parts that do not cause airway inflammation, so no sputum appears. You can treat esophagitis with medications to make the cough lessen or disappear. The more commonly used ones like omeprazole, mosapride, and metsylline can improve the symptoms of esophagitis and are good for treating gastritis, and you can also relieve dry cough by drinking more water.