Cold is an acute upper respiratory tract infection, which is a series of acute inflammatory reactions in the nose, mouth, throat and pharynx following a viral or bacterial infection in the body. The most common cause of a cold is a viral infection, which is usually caused by a respiratory virus and manifests itself as a dry throat, sore throat, nasal congestion, runny nose and other symptoms of catarrh. After a viral infection, it leads to a low immune system, which makes it easy for the bacteria normally present in the oropharynx to multiply and thus secondary to bacterial infection. If a cold patient has a runny nose and coughs up pus sputum, the possibility of bacterial infection should be considered. It is recommended to clarify the routine blood test for any blood abnormalities, and if necessary, antibiotics, including cephalosporins or quinolones, can be used for bactericidal treatment to achieve a cure.