Dry heaving cough causes: first, acute and chronic pharyngolaryngitis, especially long-term smoking and drinking patients, or belonging to a kind of metamorphosis, sensitive body caused by the airway is too sensitive, is highly reactive airway. Performance similar to atypical degenerative asthma, manifested as dry cough. Second, the patient has reflux esophagitis symptoms, that is, frequent nausea, acid reflux, epigastric fullness, retrosternal burning sensation. However, some patients do not have subjective symptoms of acid reflux, but there is the phenomenon of acid reflux, that is, gastric acid with digestive enzymes reflux to the upper esophageal sphincter to reach the pharynx, the mucous membrane of the pharynx, the mucous membrane of the voice box trachea produces a chronic irritation caused by dry vomiting and coughing. Third, the existence of nasal cavity, sinus inflammatory diseases, secretions to the nasopharynx reflux stimulation of the pharynx to produce a reaction, mucus adherence to the wall of the throat to produce an irritating reaction, such as dry vomiting, cough and other symptoms.