Asthma in children is often caused by a specific stimulus in the forms of common asthma irritants. These irritants cause dryness in the airways, therefore it compensates by producing excessive amount of mucus as lubrication but it only adds up to an already distressed airway. As the airway gets narrowed, oxygen supply starts to deplete resulting to shortness of breath. The wheezing sound of the cough is resulted by mucus build up in the lungs.
