Most people with the disease have both chronic bronchitis and emphysema. But you could have just one and still have COPD.
With chronic bronchitis, the airways that lead to your lungs are inflamed, and over time their lining changes. This leads to a cough that won’t go away and too much mucus.
Emphysema causes air sacs in your lungs to break down. When this happens, you have a hard time getting oxygen into your blood.