Bronchitis is primarily due to a decline in a person's immune resistance, followed by bronchial infection by external microorganisms, causing local inflammation in the bronchi and the formation of a large amount of secretion. The main symptoms exhibited by patients are coughing and expectoration. The treatment of bronchitis should first be handled as an infectious disease, providing appropriate anti-infection treatment, such as antibacterial and antiviral therapy. Additionally, if the patient presents symptoms of coughing and expectoration, some expectorants and symptomatic cough suppressants should be administered. If the patient exhibits symptoms of wheezing and breathlessness, treatments such as nebulization, spasm relief, and asthma relief should be given. Generally, the treatment duration for bronchitis is about a week, and the symptoms can generally be completely controlled. (Medications should be used under the guidance of a doctor.)