COPD – Symptoms and causes – Mayo Clinic

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.

https://www.mayoclinic.org/diseases-conditions/copd/symptoms-causes/syc-20353679