Bronchitis can be divided into chronic bronchitis and acute bronchitis. Chronic bronchitis has a long course and does not heal easily, while acute bronchitis has an acute onset but heals quickly. The main symptom of chronic bronchitis is a recurrent and worsening cough, which is intense in the early morning after waking up and reduced during the day, and in severe cases the cough is uncontrollable day and night. Sputum is not easy to cough up, and the sputum is white, sticky and foamy. When combined with respiratory tract infections, symptoms of wheezing can occur, and recurrent infections are likely to occur due to seasonal temperature changes. In most patients, there are no specific signs in the early stage, and dry and wet rales can be heard. Patients with acute bronchitis may present with symptoms of respiratory tract infection at the onset, including nasal congestion, runny nose, sore throat, hoarseness, etc., as well as low-grade fever, fear of cold, malaise, coughing, and coughing up sputum. The cough may be triggered or aggravated by inhalation of cold air or irritating odors or by exposure to cold, and may lead to nausea and vomiting and pain in the chest muscles when the cough is severe. Treatment should follow the doctor’s advice and not self-medication, especially antibiotics.