Chronic cough can be caused by many
factorsFactor ix complex from either the upper airway, such as the sinuses, or the lower airways, such as the lungs. Since the chest x-ray is
normalNormal saline flush, perhaps a lung function test and a CT scan of the sinuses might provide some insight as to the cause of this problem. I would continue to work with your daughter’s doctor to determine the possible cause of this continued problem.