The main clinical symptoms of acute and chronic bronchitis are cough, expectoration and asthma. Fever may occur in a few patients, which may be caused by bronchial inflammation, but other physical and chemical factors are not excluded. Some bronchitis is also called asthmatic bronchitis, that is, besides coughing and expectoration, there can be wheezing.

When asthmatic bronchitis attacks, it will mainly be cough accompanied by asthma, mostly caused by infection. However, asthma is mainly wheezing, most of which may be induced by allergies. In the process of occurrence and development, various infections may be mixed, which may also lead to acute exacerbation of asthma. Acute or chronic bronchitis is accompanied by fever, cough and expectoration. In contrast, other clinical symptoms will be significantly relieved compared with pneumonia. Most patients with bronchitis will not have chest pain symptoms, and even if they have a fever, their body temperature will not be high. Most patients with bronchitis may have elevated hemogram, but C-reactive protein may not be high.