الفهرس 
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Abstract
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Rates of asthma have increased significantly between the 1960s and 2008 as of 2011, 235 million people worldwide were affected by asthma approximately 250,000 people die per year from the disease. And current trends suggest that an additional 100 million people may be living with asthma by 2025. The rates vary between countries with prevalence between 1 and 18%. It is more common in developed than developing countries. Within developed countries it is more common among those who are economically disadvantaged while in contrast in developing countries it is more common amongst the affluent. The findings suggest an increasing prevalence of asthma in Africa over the past two decades. Due to the paucity of data, we believe that the true prevalence of asthma may still be under-estimated.
Economic analyses in many African settings have been implanted in most rural areas shown that direct costs from asthma are usually greater than the indirect costs. However, indirect costs represent a relatively higher proportion of total costs in pediatric than in adult.
Exposure to common allergens (including pollens, dust mites, and animal furs) and indoor and outdoor air pollution from various sources (eg, traffic pollution, combustion of fossils and biomass fuels, workplace dust) have all been implicated as triggers of the disease Viral infections, a major cause of upper respiratory tract infections and “common cold,” are also a common risk factor in children