Chronic Obstructive Pulmonary Disease
Chronic obstructive pulmonary disease (COPD) is a respiratory system condition than can include emphysema, bronchitis, and asthma. Common causes include infections, smoking, exposure to secondhand smoke, radon, asbestos, or other forms of air pollution. COPD is the most common respiratory system disease, with 220 million COPD patients worldwide in 2020.