Asthma By Victor E Ortega, MD, PhD, Mayo Clinic Arizona; Manuel Izquierdo, DO, Wake Forest Baptist Health Reviewed / Revised Mar 2022 | Modified Sep 2022 View Patient Education Epidemiology Etiology Pathophysiology Classification Symptoms and Signs Diagnosis Prognosis Treatment Special Populations Key Points More Information Topic Resources Peak Expiratory Flow Prediction Classification of Asthma... Classification of Asthma... Steps of Asthma Management * Asthma is a disease of diffuse airway inflammation caused by a variety of triggering stimuli resulting in partially or completely reversible bronchoconstriction.