Symptoms of bronchial mucus plugs are coughing up sputum, difficulty in breathing, chest tightness, etc. It is impossible to generalize the symptoms due to the different conditions of individuals. Bronchial mucus plugs are mainly due to an abnormal increase in bronchial secretions, and their sputum is relatively thick. When the patient does not expel the sputum from the body in time, or the secretion is not functioning well, the secretion stays in the trachea for a long time, and a blockage occurs in the trachea. The patient’s symptom is coughing, and the organism will expel the sputum plug from the body through coughing. Or the symptoms of coughing up sputum, when the sputum blocked the small airways, it will lead to blockage of the airway, affecting breathing, and dyspnea. In some patients, symptoms of chest pain may occur due to mucus irritation of the bronchial mucosa, which can be aggravated when coughing and after strenuous exercise. The symptoms cannot be generalized as they vary from individual to individual. Once a patient develops symptoms suspected to be bronchial mucus plugs, he or she should go to a regular hospital and undergo a relevant examination in order to identify the cause of the disease.