Chronic cough is one of the most common respiratory symptoms, especially in children. And it can be the sale presenting manifestation of bronchial asthma. Although most coughs are self limiting, chronic cough often proves to be a frustrating problem. It is commonly defined as a persistent or recurrent cough exceeding 3weeks duration. The post nasal syndrome has been determined to be the most common cause of chronic cough, followed by asthma, chronic bronchitis, gastroesophageal reflux and bronchiectasis. This study was performed at both City-Oriental Medicine Hospital and Pundang Cha Oriental Medicine Hospital from January,1,1998 to November 31,1998, and 114 children with chronic cough persisting for longer than 3 weeks were evaluated. We investigated the clinical findings and evaluated the etiology in children with chronic cough syndrome including: type of cough (with or with out sputum and daily onset) and associated signs & symptoms. The results were as follows: The most common cause of chronic cough was asthma with sinusitis (27.2%); The second and third were post nasal drip syndrome(22.8%) and bronchial hypereactivitic cough(14.9%). The other causes included asthma, paranasal sinusitis, bronchitis and rhinitis. Therefore, in the diagnostic and therapeutic approach to this symptom, it should be considered that the cause of this type of cough is either bronchus and pulmonary disease or that associated with another problem, especially sinusitis, gastroesophageal reflux and allergic disease. Also, in infants and toddlers, congenital abnormaly should be considered.