What is chronic bronch it is?2022-03-11Chronic bronchitis is a chronic nonspecific inflammation of the trachea, bronchial mucosa and surrounding tissues. Clinically, the main symptoms are cough and expectoration , and the disease lasts for 3 months every year for 2 years or more. Other diseases with cough, sputum, wheezing symptoms were excluded (such as tuberculosis, pneumoconiosis, lung abscess, heart disease, cardiac insufficiency, bronchiectasis, bronchial asthma, chronic nasopharyngitis, esophageal reflux, etc.)