There are many reasons for children to cough with green nasal discharge, which is common in the case of upper respiratory tract infections, rhinitis, sinusitis and other diseases. 1. Upper respiratory tract infection: often caused by bacterial or viral infection of the respiratory tract. Under normal circumstances, the nasal mucus is mostly clear or white, but due to bacterial or viral infection, the nasal mucus is stagnant and manifests itself as greenish mucus; in addition, coughing, low fever and other manifestations can also occur. 2. Rhinitis: mainly non-allergic rhinitis, often secondary to bacterial or viral infection, is an inflammation of the airway mucosa. Clinical manifestations of cough, runny nose, nasal congestion and other manifestations, if the infection of inflammation, nasal discharge can be green. 3. Sinusitis: sinusitis can secrete a lot of secretions in the nasal cavity, can stimulate the throat to trigger the performance of cough, if the secretions are not discharged in time, it can be manifested as green nasal discharge. Therefore, the child running green nose cough, should be timely to the hospital, clear cause, under the guidance of the doctor for treatment.