Airway inflammation is a complex inflammatory process of airways involving the contribution of various cells, recruited and activated in asthmatic conditions, and the mediators released by them. However, major components contributing to this inflammation are eosinophils, mast cells, and lymphocytes. In inflamed airways, the lumen becomes narrow and edematous due to mucus plug formation, made up of proteins from airway vessels and epithelial cells of airways. Airway inflammation also involves epithelial wall shedding that has been observed in the airway lumen of asthmatic subjects. These changes are also observed in patients suffering from mild asthma (Busse et al. 2001; Bousquet et al. 2000).