The condition of phlegm accumulation in the esophagus is caused by the following aspects: I. Patients suffering from esophagitis, reflux esophagitis, due to the reflux of gastric acid into the esophagus, will stimulate the mucosal tissue of the esophagus, causing mucosal tissue damage, inflammation, edema, congestion, secretion of mucous tissue, can actively regulate reflux esophagitis, commonly used drugs such as domperidone, morbutine, etc. Second, pharyngitis, if suffering from pharyngitis, usually the mucosal tissue in the throat area will be damaged, which can also trigger the symptoms of phlegm accumulation in the esophagus. Third, reflux gastritis, patients suffering from reflux gastritis, gastric acid reflux into the esophagus, stimulating and damaging the esophageal mucosa, tissue mucosa, causing esophagitis, resulting in esophageal phlegm accumulation. Fourth, certain other lesions of the esophagus, such as esophageal tumors, can also trigger the phenomenon of esophageal phlegm accumulation, mostly accompanied by symptoms of swallowing difficulties.