What are the 4 stages of COPD

What is a Chronic Obstructive Pulmonary Diseases (COPD)? Chronic Obstructive Pulmonary Disease (COPD) is a progressive lung condition that causes airflow obstruction, making breathing difficult. People with COPD may experience lung damage or phlegm blockage. Symptoms include fatigue, wheezing, breathing difficulties, and coughing, occasionally with phlegm. The most prevalent causes of COPD are air pollution…