[Approach to chronic cough].

Chronic cough, that 10-38% outpatients have, is an important cause of morbidity and mortality. This symptom can be seen 3-40% of adult patients and reduces quality of life. 95% patients that cough chronically have one of these three diseases: upper airway cough syndrome, gastroesophageal reflux or asthma. In this review these three diseases and rare causes of chronic cough will be discussed and diagnostic steps will be explained.