If the runny green nose is usually caused by an infection of the mucous membrane of the nasal cavity and sinuses, it is classified as acute or chronic. If it happens only for a short period of time, it is most commonly caused by upper respiratory tract infection, common viral infections such as rhinovirus and coronavirus, which can lead to runny nose. 3-5 days later it thickens and turns yellowish green, usually caused by bacterial infection, which can be treated with antibiotics, preferably cephalosporin antibiotics, together with mucus promoters and nasal rinses. Therefore, usually pay attention to exercise and avoid colds in order to avoid blowing the nose. Some patients will have recurrent green nasal discharge, usually caused by chronic sinusitis, which is also accompanied by nasal congestion, head swelling and pain. In severe cases, if conservative treatment is not effective, surgery may need to be considered. Therefore, if a patient has green nasal discharge for a long time, he/she should go to hospital for examination, and according to the examination results, he/she should treat under the guidance of the doctor, strengthen the resistance, pay attention to hygiene and cleanliness, etc., and avoid further progress.