Esophageal cancer can cause coughing for the following reasons: 1. If esophageal cancer develops to a certain extent, such as middle esophageal cancer can stimulate tracheal bulge and produce coughing symptoms; 2. Some patients with esophageal cancer, especially middle esophageal cancer, can have tumor necrosis locally, which will form a hole after necrosis and will penetrate the esophageal wall to produce esophagotracheal fistula, which is more affected by saliva or gastric acid reflux, and the refluxed liquid will The refluxed liquid will reach the trachea and even the lung through the fistula, which will stimulate the lung to produce coughing symptoms and even coughing sputum; 3.Esophageal cancer is a malignant tumor, and if it develops to a certain extent, malnutrition will occur, which will affect the whole body of the patient, and the resistance of the body will decrease and pneumonia will appear, and the patient will not only cough, but also cough sputum and even fatal lung infection.