The greenish color of nasal mucus is mainly considered to be an upper respiratory tract infection caused by bacterial infection such as Pseudomonas aeruginosa. If the upper respiratory tract infection is caused by bacterial infection, it attacks the mucous membrane of the nasal cavity and sinuses, causing rhinitis-sinusitis, thus causing the patient to have runny nose and yellow snot, yellow-green snot, etc., accompanied by symptoms such as coughing and coughing up phlegm. If fever occurs, there can be simultaneous soreness of the limbs, fatigue and so on. Treatment requires antibiotic anti-infection therapy. Nasal discharge green color, may also be nasal foreign body secondary infection, nasal tumors and other diseases caused by, therefore, need to consult a doctor in a timely manner, to identify the cause, follow the doctor’s instructions standardized treatment.