Yellow-green runny nose in children usually does not heal itself and requires reasonable treatment according to the situation in order to heal. The yellowish green nasal discharge in children is due to the fact that nasal discharge contains many neutrophils, which have the function of phagocytosis of bacteria and can remove foreign pathogens from the organism. The yellow-green color of nasal mucus indicates that the organism is infected by bacteria, and the child may have rhinitis, sinusitis and other upper respiratory tract infections. It is recommended to take the child to the pediatric department of the hospital for routine blood tests to clarify the degree of infection and take antibiotics under the guidance of the doctor. In daily life, the child should avoid spicy, stimulating and cold food, eat more fresh fruits and vegetables, drink more warm water, pay attention to rest and warmth, ensure sufficient sleep, and maintain a relaxed mood.