If you have a chronic cough, constant sputum production, shortness of breath or have been exposed to known risk factors, you should see a doctor.
The diagnosis can be confirmed by lung function testing.
Disease symptoms are frequently initiated by a severe attack of bronchitis, usually during the wintertime when influenza and colds are endemic. If you have an irritating persistent cough accompanied by sputum production or a wheeze, you should make an appointment to see the doctor without delay.
(Health24)