Prolonged nausea, dry heaving, phlegm and dryness are considered to be related to laryngitis, bronchitis and throat cancer. 1. Pharyngolaryngitis: local inflammation caused by viral or bacterial infection in the throat area stimulates the pharyngeal mucous membrane, which makes the patients suffer from nausea, dryness and vomiting, dryness of throat, and due to the increase of inflammatory secretion, the patients are also prone to sputum. 2. Bronchitis: Due to the damage and inflammation of bronchial mucosa, bronchitis patients will stimulate the mucosa of pharynx, which will make the patients suffer from nausea and dryness of throat; meanwhile, due to the invasion of bronchial mucosa by inflammation, it will lead to the increase of secretion, which will form phlegm along with the bronchial tubes and the oral cavity of the patients. 3. Pharyngeal cancer: Due to the compression of tumor on pharyngeal area, the pharyngeal area will be stimulated, which will lead to nausea, dryness and vomiting, dryness and pain in the throat, and when the tumor breaks down on the surface, it will lead to the discharge of purulent secretion to form sputum, which is usually accompanied by blood in the sputum. Therefore, if the above symptoms occur for a long time, it is recommended to consult a doctor in time to find out the cause of the disease under the guidance of a professional doctor and take appropriate treatment.