Patients with viral colds are also likely to have coughing symptoms, whether it is a bacterial or viral cold, a wind-heat cold or a wind-cold cold. Coughing phlegm is due to the invasion of the respiratory mucosa by pathogens, and there is an increase in mucosal secretions forming phlegm, which stimulates the body to produce a coughing reflex and cough up the phlegm, so regardless of the type of cold, there will be an increase in phlegm secretion and coughing phlegm. The possible difference between viral and bacterial colds is that viral colds are more likely to cough up white phlegm, while bacterial colds may have coughing up yellow or greenish phlegm, which is somewhat related to the type of bacteria infected. If the coughing sputum is very severe, or even if there are symptoms such as wheezing and chest tightness, it is important to consider whether the cold has progressed to become a case of bronchitis, bronchitis, or even pneumonia.