Cough in children.

Cough is a common presenting problem in children. A persistent moist or productive cough is always abnormal. The history, examination, chest x-ray and spirometry usually provide clues to specific causes of cough. Non-specific cough, defined as a non-productive or dry cough in the absence of identifiable respiratory disease, is poorly understood. We briefly discuss major controversies in non-specific cough and its management in children.