Asthma

"Introduction: Asthma is a chronic inflammatory disorder of the small airways characterised by episodes of acute exacerbation. The disorder causes airflow restriction to the alveoli as a result of concurrent airway constriction and obstruction. Once considered to be a simple disease, it is now understood to be a complex and multifactorial collection of conditions that limit airflow through both acute and chronic airway changes (Myers & Tomasio, 2011; Saetta & Turato, 2001)."--page 240