How an asthma attack occurs - animation

Asthma (from the Greek άσθμα, ásthma, "panting") is the common chronic inflammatory disease of the airways characterized by variable and recurring symptoms, reversible airflow obstruction, and bronchospasm.Symptoms include wheezing, coughing, chest tightness, andshortness of breath. Asthma is clinically classified according to the frequency of symptoms.