Asthma is a long-term (chronic) lung disease that causes episodes of coughing, wheezing and shortness of breath. In the latest article by the Allergy and Asthma Network, they define the most common symptoms of asthma, how asthma affects the lungs, the difference between quiet asthma and noisy asthma and what causes asthma to develop and symptoms to flare. Review the entire article here.