Hi,
If you do not smoke or if you are not taking any medications, differentials that need to be ruled out are infection, allergies,
heartburn and asthma. Your medical history
and complete physical examination are initially done by your doctor. And depending on the results, additional tests may be done.Chest x-ray or blood tests will help rule out infection while pulmonary tests are needed to rule out asthma. Talk to your doctor about this and do keep us posted.