A runny nose that turns green indicates the presence of a bacterial infection and does not mean that it is getting better. Common diseases that tend to runny nose are acute rhinitis, chronic simple rhinitis, allergic rhinitis, vasomotor rhinitis and other types of nasal mucus, which is usually clear water, sticky or sticky white. As the degree of the disease progresses, the patient’s nasal mucus is green, which means that the patient has a secondary manifestation of purulent bacterial infection, mostly due to Pseudomonas aeruginosa infection. When the acute purulent inflammation is not effectively controlled in time, some cases tend to become chronic with persistent symptoms or intermittent episodes. Patients should go to regular hospitals, do systematic examination, clear diagnosis, and follow the doctor’s instructions for standardized treatment.