COPD - Symptoms and causes - Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/copd/symptoms-causes/syc-20353679
WEBApr 15, 2020 · Chronic obstructive pulmonary disease (COPD) is a chronic inflammatory lung disease that causes obstructed airflow from the lungs. Symptoms include breathing difficulty, cough, mucus (sputum) production and wheezing. It's typically caused by long-term exposure to irritating gases or particulate matter, most often from cigarette smoke.
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