The presence of a runny nose is commonly associated clinically with an inflammatory response of the respiratory system. For example, acute rhinitis, sinusitis, chronic rhinitis, acute attacks of sinusitis. Because the body’s immunity is reduced, but also by the invasion of pathogens, including bacteria, especially purulent bacteria make the nasal mucosa, sinus mucosa appears congestion, edema and a large amount of yellow purulent secretions exuded, and appear to have the symptoms of yellow water from the nose. At this time, you should pay attention to keep warm and avoid getting cold again. If necessary, antibiotics such as erythromycin, clindamycin, azithromycin, levofloxacin, etc. can be taken to fight against septic bacterial infections. If necessary, you can also use saline or anti-inflammatory medication to flush the nasal cavity and sinuses.