The common cold, also known as acute upper respiratory infection, is generally caused by a viral infection for most patients. For the first three days before catching a cold, patients typically experience a dry cough without phlegm. After symptoms persist for two to three days, some patients may develop a bacterial infection as well. Therefore, at this point, some patients with the common cold might also experience varying degrees of phlegm production. In the case of the common cold, once a diagnosis is confirmed, it is important to promptly administer appropriate treatments such as antivirals and heat-clearing detoxifying medications to alleviate the acute clinical symptoms of the patient. By effectively alleviating these symptoms, it prevents the patient from developing additional bacterial infections, thus avoiding the occurrence of a cough with phlegm.