Bronchial asthma is the most common chronic lung disease in children which strongly affects the health of growing child. A chronic inflammatory disorder of the airways in susceptible individuals’ symptoms are usually associated with widespread but variable airflow obstruction and an increase in airway response to variety of stimuli Obstruction is often reversible either spontaneously or as a result of treatment. It is defined by the history of respiratory symptoms such as wheeze, shortness of breath, chest tightness and cough.