What are the factors of the incidence of chronic bronchitis

Chronic bronchitis is the trachea, bronchial mucous membrane and its surrounding tissue of chronic inflammation. Clinical chronic cough, sputum or with the characteristics of breathing space. The first is that patients with early symptoms of cough, sputum to Kechu. Chronic bronchitis is the synergies arising from multiple factors, such as smoking, occupational dust exposure, upper respiratory tract infections, allergies, air pollution, respiratory and other local immune function, including long-term exposure to smoke dust is positive factors. Had chronic bronchial, if not treated early, a lot of harm. Long-term cough and repeated infections, diseases can spread to the terminal bronchiole vesicles, suffering from pneumonia or emphysema, may also lead to pulmonary hypertension and left ventricular failure - pulmonary heart disease.