The change from clear nasal mucus to yellow nasal mucus is usually triggered by the worsening of cold symptoms. From the perspective of Chinese medicine, clear nasal discharge belongs to wind-cold cold, while yellow nasal discharge belongs to wind-heat cold. When the wind-cold cold is not well controlled and is further infected by bacteria and pathogens and combined with the wind-heat cold, the clear nasal mucus will turn into yellow nasal mucus. From the perspective of Western medicine, clear nasal discharge is a viral cold and yellow nasal discharge is a bacterial cold. At the beginning of the cold, there is a viral infection, and the medication is not timely or the body’s immunity is too poor, bacteria will take advantage of the opportunity to invade the body, there will be a clear nose into yellow snot symptoms, the need for anti-inflammatory drugs on the basis of the conventional anti-cold medicines.