There are the following clinical possibilities: 1. Acute and chronic sinusitis, which is mainly manifested as purulent inflammatory infection induced by bacterial infection in the sinuses and nasal cavity, manifested as long-term yellow pus nasal discharge, nasal disinflation, headache and other related symptoms, some patients may be accompanied by fever and other performance, clinically through the sinus CT can be seen in the sinus soft tissue shadow and other related changes. 2. Children with nasal foreign body, manifesting as unilateral recurrent yellow pus nasal discharge, mainly due to local infection of foreign body in the nasal cavity inducing recurrent yellow pus nasal discharge. 3. Some patients have something growing in the nasal cavity, commonly including nasal invagination papilloma, nasal malignant tumor, maxillary sinus cancer and other cancers, inducing local infection and recurrent yellow nasal discharge accompanied by foul odor.