Bronchitis
Bronchitis is an infection of the airways in the lungs. In lung cancer patients, there is irritation and inflammation of the bronchi, which worsens with the tumor growth. In combination with the two other lung infections, bronchitis, pneumonia, and emphysema are in later stages of lung cancer. While some patients only develop chronic bronchitis, the doctors suggest that these patients do not progress towards the later stages of lung cancer. Some patients also develop asthma and tuberculosis, and bronchitis, thus indicating tumor growth in the lungs. There is an increase in mucus production in the airways, leading to the blockage of airflow through these air passageways in the patients with bronchitis. The persistent symptom of bronchitis leads to the lung damage, which is mostly permanent and greatly reduces the lung function.