Pus nasal discharge is mostly caused by rhinitis and wind-heat cold. When pus nasal discharge occurs, nasal congestion, headache, yellow snot, even accompanied by blood in the nose and sore throat occur, and treatment for this kind of wind-heat rhinitis and wind-heat pharyngitis needs to be given to clear the heat, relieve the symptoms, clear the lung and resolve phlegm. After treatment, pus nasal discharge turns into clear nasal discharge, which is considered to be an obvious sign of improvement. At this time, it is not advisable to clear heat excessively so as not to hurt the lung and yang qi of the body. If only clear nasal discharge is considered to be caused by wind-cold, the runny nose caused by wind-cold is mostly characterized by bad cold, bad wind and headache. If clear nasal discharge turns into pus nasal discharge, it is considered that the condition is aggravated, and if pus nasal discharge turns into clear nasal discharge, it is considered that lung heat has been removed and tends to improve. For the time being, it is not advisable to eat a diet that is too pungent, hot, spicy and stimulating, and pay attention to the rehabilitation treatment during the recovery period.