Runny nose is usually a symptom after a cold, this clear nose is some secretions from the respiratory tract, and the absence of abnormal color in the nasal discharge means that there is no abnormal bacterial growth in the mucous membrane, so the treatment is generally based on medical advice to rest, drink more water and enhance immunity, and this kind of disease can often heal itself in 3-5 days. However, if the color of clear nasal discharge gradually changes to other colors, such as yellow, then there may be Staphylococcus aureus infection, and then antibiotic anti-infection treatment is needed on the basis of lifestyle conditioning.