Patient: nasal congestion, runny nose, nasal secretions in the nasal cavity. In the past winter, when encountering cold air, I like to runny nose. What is the cause of the runny nose. Doctor: If the deviation of nasal septum is obvious, surgery is still needed, because it is an abnormal bone structure, the effect of medication alone is not ideal. The runny nose may be caused by a combination of allergic rhinitis, if it can be diagnosed, some anti-allergic drugs can be used for treatment.