Frequent cough without nasal discharge may occur in environmental stimuli, respiratory tract infections, cough variant asthma, gastroesophageal reflux disease and other conditions. 1. Environmental stimulation: If the dust, smoke or cold air in the living environment stimulates the respiratory tract, it can stimulate the mucous membrane of the respiratory tract, and the cough will appear, and it usually does not affect the nasal mucous membrane, and most of them do not have nasal secretion. 2. Respiratory tract infection: If the cough appears in the cold, rain, etc., consider the possibility of respiratory tract infection. It leads to acute tracheitis, bronchitis, pneumonia and other diseases. Usually combined with coughing sputum, fever, fatigue and other manifestations. 3. Cough variant asthma: mostly related to genetic factors, occurring after exposure to allergens, usually with cough as the only symptom, often worsened at night or early in the morning. 4. Gastroesophageal reflux disease (GERD): prolonged irritation of the throat by stomach acid and stomach contents can cause an irritating dry cough, usually without the symptom of a runny nose. 5. Others: Irritating cough should also be noted to exclude other lung diseases, including allergic cough, eosinophilic bronchitis and so on. In short, the presence of a frequent cough without a runny nose, should be promptly to the hospital, under the guidance of the doctor for treatment.