Chronic cough is defined as persistence of the symptom for longer than one month. It is a common reason for consultation. A systematic diagnostic approach based on the history, clinical examination and a number of investigations (chest x-ray, lung function tests, oesophageal pH monitoring and sinus
Coughing that lasts >3 weeks is generally considered chronic. The causes of chronic cough are many. Most often, chronic cough is due to postnasal drainage, asthma, and/or gastroesophageal disease. However, other causes such as laryngopharyngeal reflux, vocal cord dysfunction, occult sinusitis,