There are many reasons why a 4-year-old child always has green nasal discharge, commonly respiratory tract infections, sinusitis, etc., the specific treatment according to the cause of the selection of appropriate medication. If the bacterial infection can be cefaclor and other drugs. 1. Respiratory tract infections: mostly bacterial or viral infections, and mostly for the upper respiratory tract. Initially, it is mainly clear nasal mucus, with the progress of the disease, there can be green nasal discharge, cough, fever and other manifestations. If the bacterial infection, you can use such as cefaclor, cefdinir and other treatments; if the viral infection, you can take oseltamivir and so on. 2. Sinusitis: generally secondary to upper respiratory tract infection, acute rhinitis, nasal deformity, etc., is the most common cause of green snot, and often have nasal congestion, fever, headache and other manifestations. It is recommended to use antibiotic treatment, such as cefaclor, etc., can also use hormones such as mometasone furoate nasal spray nasal spray to improve the nasal symptoms, the symptoms are serious, can be surgical treatment. In short, the above symptoms, should be timely to the hospital, a clear diagnosis, under the guidance of the doctor’s treatment. The above drugs need to be used under the guidance of a doctor.