Original Article: http://www.mayoclinic.com/health/medical/IM03162
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If you have asthma, the inside walls of the airways in your lungs can become inflamed and swollen. In addition, membranes in your airway linings may secrete excess mucus. The result is an asthma attack. During an asthma attack, your narrowed airways make it harder to breathe and you may cough and wheeze.