What are the four stages of chronic obstructive pulmonary disease (COPD) and the symptoms of each?

the stages and symptoms of copd are:
mild. your airflow is somewhat limited, but you don’t notice it much.
— Read on www.webmd.com/lung/copd/qa/what-are-the-four-stages-of-chronic-obstructive-pulmonary-disease-copd-and-the-symptoms-of-each

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