Asthma is a chronic lung disease which narrows and inflames the airways. It can occur in individuals irrespective of their age, even in infants; most children with the illness developed it by about age five and more common in boys than in girls in early childhood and the tendency to develop it often runs in families.It causes breathing problems, with symptoms like coughing, wheezing, and shortness of breath. "Asthma is most common during childhood and affects at least 13% of Canadian children. According to the World Health Organization, asthma is now a serious public health problem with over 235 million sufferers worldwide. According to Statistics Canada, 8.5% of the population aged 12 and more have been diagnosed as having asthma in 2010. Asthma continues to be a major cause of hospitalizatio n of children in Canada"