Emphysema and chronic bronchitis are the two most common conditions that contribute to COPD. Typically, these two conditions coexist and can vary in severity among individuals with COPD.
Chronic bronchitis refers to the inflammation of the bronchial tube linings, which are responsible for transporting air to and from the tiny air sacs (alveoli) in the lungs. This condition is marked by a persistent daily cough and the production of mucus (sputum).