Common symptoms of bronchitis include coughing and phlegm production, and some people may also experience chest tightness and shortness of breath. What should be done if chest tightness and shortness of breath occur? First, medication should be used according to the cause of the condition, such as using sensitive antibiotics if it's caused by a bacterial infection. If it is due to allergic factors, antiallergic drugs or corticosteroids can be chosen. In addition, symptomatic treatment can be considered, such as using bronchodilators to alleviate symptoms of chest tightness. Furthermore, if there is phlegm, expectorant medications can be used to ease symptoms and reduce respiratory tract resistance, which also helps relieve chest tightness.