tracheitis

Chronic bronchitis is caused by inflammatory changes in the trachea and bronchial mucosa due to infection or non-infectious factors, and increased secretion of mucus. Clinically, it is characterized by long-term cough, expectoration, or wheezing. The early symptoms of this disease are relatively mild, and most of them occur in winter, and are relieved after warm spring, and the course of disease is slow, so it is not noticed. When advanced disease progresses and obstructive emphysema occurs, lung function is impaired, which greatly affects health and labor. This disease is one of the most common diseases in China. The age of onset is more than 40 years old. The smoking patients are significantly higher than the non-smokers.