Asthma is a pathophysiological condition associated with eosinophilia and heightened inflammatory reactions, epithelial desquamation, hyper responsiveness, recurring episodes of reversible broncho-constriction, and mucus hyper secretion from the respiratory organs. Asthma interludes can be triggered by a variety of factors most notably allergens, infectious agents, pollutants, and nonspecific stimuli such as exercise, nutritional factors and emotional stress. Certain genes and their polymorphism may also have effects in the initiation and progression of asthma.