الفهرس 
INTRODUCTION AND RATIONALOnly 14 pages are availabe for public view
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Abstract
Asthma is a chronic inflammatory disorder of the airways that leads to recurrent episodes of wheezing, breathlessness Chest tightness, and coughing, particularly at night or in the early morning. This inflammation leads to reversible airflow obstruction within the lung. People with asthma have highly sensitive airways that become inflamed easily. They have asthma all the time, but they have asthma episodes or attacks only when something bothers their airways. During an episode, they may cough and wheeze or become short of breath. Sometimes an episode is so severe, they need emergency medical attention to breathe normally again.
Asthma is a serious public health problem throughout the world, affecting people of all ages. Uncontrolled asthma can place severe limits on daily life, and is sometimes fatal. It appears that the global prevalence of asthma ranges from 1% to 18% of the population. Asthma is one of the most common chronic disorders in childhood. The WHO has estimated that 15 million (DALYs) are lost annually due to asthma, representing1% of the total global disease burden.
The prevalence of asthma among Egyptian children aged 3 - 15 years