Bronchitis is characterized by recurrent cough and sputum. Bronchitis is divided into acute bronchitis and chronic bronchitis according to the duration of the disease. Acute bronchitis has an acute onset after exposure to cold or alcohol, with a more rapid onset, milder systemic symptoms, and fever. At the beginning of a dry cough or a small amount of mucous sputum, followed by an increase in the amount of sputum, cough worsening, occasionally accompanied by blood in the sputum. Chronic bronchitis is due to a variety of reasons for the non-specific inflammation of the bronchial tubes, the onset of the disease lasts three months or even longer each year, the onset of two consecutive years and more. Chronic bronchitis is characterized by recurrent episodes of coughing and sputum, and if combined with an infection, severe fever may occur. Patients with acute bronchitis should seek timely medical treatment to prevent the condition from developing into chronic bronchitis. Patients with chronic bronchitis should be regular in their daily life, reduce late nights and strictly quit smoking.