Bronchitis means the airways are inflamed and narrowed. People with bronchitis often produce sputum, or phlegm.
Emphysema affects the air sacs at the end of the airways in your lungs. They break down and the lungs become baggy and full of holes which trap air. These processes narrow the airways. This makes it harder to move air in and out as you breathe, and your lungs are less able to take in oxygen and get rid of carbon dioxide.
COPD stands for:
Chronic=it’s a long-term condition and does not go away
Obstructive=your airways are narrowed, so it’s harder to breathe out quickly
Pulmonary=it affects your lungs
Disease=it’s a medical condition