First clear nasal discharge and then pus nasal discharge, considering the combination of bacterial infection, usually associated with colds leading to acute sinusitis, allergic rhinitis with sinusitis, etc., the specific should be combined with the relevant accompanying symptoms for differential analysis.
1. Acute sinusitis caused by cold: for example, common cold, influenza, the initial clear watery nasal mucus. If accompanied by bacterial infection, acute sinusitis may be induced, and the clear nasal mucus will become purulent nasal mucus.
2. Allergic rhinitis with sinusitis: related to contact with allergens, such as pollen, mites, dust, repeated allergen stimulation, nasal congestion, increased nasal secretion, nasal itching and other symptoms, nasal discharge is mainly clear nasal discharge. If the duration of the disease is long, it may induce bacterial infection and form chronic sinusitis, then there will be pus nasal discharge.
If the above symptoms occur, you should consult a doctor in time, and under the guidance of a professional physician through nasal endoscopy, sinus CT and other examinations to understand the cause of the disease before treatment.