The change from yellow to white nasal discharge is usually a sign of improvement. From the perspective of Chinese medicine, cold is divided into wind-cold cold, wind-heat cold and summer-damp cold. When a cold belongs to wind-heat type, the nasal discharge is yellow, and there will be pus nasal discharge, accompanied by pus phlegm. In the case of wind-cold cold, the nasal discharge is white, but when the body temperature of wind-cold cold gradually decreases, the nasal discharge will change from yellow to white, so it is a sign of improvement. From the perspective of Western medicine, there are bacterial, viral and mixed colds, and when you have a yellow nose, you have a viral cold, accompanied by a bacterial cold, and then you will have a yellow nose and symptoms such as high fever, coughing and coughing up pus. In this case, the nasal discharge changes from yellow to white, which is a clear sign of improvement, and there is only one kind of viral cold, which can be relieved by taking antiviral drugs.