Chronic bronchitis and chronic obstructive pulmonary disease are two different diseases, mainly the difference between the nature of the disease and symptoms, roughly as follows: 1. Nature of the disease: Chronic bronchitis is a pathological change that refers to chronic inflammation occurring in the trachea or bronchial mucosa and its surrounding tissues, which belongs to a non-specific inflammatory disease that can manifest clinically, specifically recurrent coughing and coughing, or accompanied by wheezing, generally It develops more than three months per year and for two consecutive years. Chronic obstructive pulmonary disease is a group of chronic airway inflammatory diseases characterized by restricted airflow, and the clinical symptoms are mainly recurrent chest tightness, wheezing, and also coughing.2. Symptoms: Because some patients with chronic obstructive pulmonary disease develop from chronic bronchitis, chronic bronchitis does not necessarily have restricted airflow, while chronic obstructive pulmonary disease must have restricted airflow, so the difference between the two can be distinguished by pulmonary function The difference between the two can be identified by pulmonary function tests.