INTRODUCTION : Asthma is the most common chronic disease of childhood and its prevalence has substantially increased worldwide, particularly in pre-school children (Masoli et al., 2004). According to many investigators asthma prevalence is above 10% in most developed countries & expected to be twice in 2020(Movahedy, 2000;Tepas et al., 2001, Liu et al., 2004,Lodrup et al., 2006). In children, asthma is the most common cause of school absence, affecting children’s educational potential and adversely affecting a child’s quality of life (Rance and Trent, 2005) and associated with significant morbidity and economic burden (Global Strategy for Asthma Management and Prevention, 1995).