Cold is mainly caused by viral infections, and the onset of the disease is quite rapid, mainly manifesting as nasal symptoms. At the beginning, the main symptoms are sneezing, nasal congestion and clear watery nasal discharge; after 2-3 days, the nasal discharge becomes sticky and may be accompanied by symptoms such as breathlessness and cough. If the cold snot becomes yellow, green and sticky, it means that there is a combined bacterial infection. Oral penicillins, first-generation cephalosporins, macrolides or quinolones can be chosen for antibacterial treatment according to local epidemiology and empirical medication. At the same time, patients should enhance their physical fitness, and their life and diet should be regular. Drink water in small amounts and several times, and pay attention to more rest. Keep the air circulation in the room as well as prevent and control secondary bacterial infection, otherwise it will lead to more prolonged disease.