Chronic obstructive pulmonary disease (COPD) 
is a group of lung diseases that block airflow and make it difficult to breathe.
Emphysema and chronic bronchitis are the most common conditions that make up COPD. Damage to the lungs from COPD can’t be reversed.
Symptoms include shortness of breath, wheezing, or a chronic cough. (Mayo Clinic, “Chronic Obstructive Pulmonary Disease”, 2023).