Bronchitis is a common clinical disease, which can generally be divided into acute bronchitis and chronic bronchitis in clinical practice. Acute bronchitis often has a sudden onset, with symptoms such as coughing and expectoration; some people may also experience fever, chest tightness, and wheezing. Typically, the course of the disease lasts two to three weeks. Chronic bronchitis, on the other hand, has a longer duration, with a more gradual onset and symptoms of recurrent coughing and expectoration, and even chest tightness. The annual duration of the disease is more than three months, with a typical onset lasting over two years, making it very long and difficult to control.