What are the 4 stages of COPD, Mild, Moderate, Severe, and Very Severe levels indicate the development of lung damage and the severity of symptoms. Individuals with the illness may face more frequent flare-ups and greater difficulties breathing. These stages are critical to understanding since they aid in determining the impact of COPD on a person's quality of life and customizing tre... https://www.uniccm.com/course/cpd-what-are-the-4-stages-of-copd