WebMD Answers
Asthma and COPD are two diseases that lead to airflow obstruction. Asthma is typically characterized by reversible airflow obstruction meaning the obstruction comes and goes. This is why asthmatics have varying symptoms. In contrast, COPD patients have chronic airflow obstruction. For some patients with asthma, they can develop airway remodelling and persistent obstruction that looks similiar to COPD on breathing tests.
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