It is likely that a more serious respiratory infection has occurred, such as a lower respiratory tract infection induced by a cold, or a weak body resistance to acute bronchitis or pneumonia. A CT chest examination is required to confirm the diagnosis. If bronchial or pulmonary inflammation does exist, it is often caused by serious bacterial, viral, Mycoplasma pneumoniae, or Chlamydia infections, and blood tests and antibodies to Mycoplasma pneumoniae and Chlamydia are required. In case of bacterial infection, intravenous antibiotic drip treatment, in case of viral infection, antiviral treatment with Tamiflu, and in case of mycoplasma and chlamydia infection, intravenous azithromycin and erythromycin are needed for anti-inflammatory treatment. In addition, a combination of cough expectorant medication, such as pulmonary cough combination, is also needed.