Pediatric yellow nasal discharge may be related to acute rhinitis, sinusitis and so on. 1. Acute rhinitis: acute inflammation of the nasal cavity caused when a viral infection is followed by a bacterial infection. Stimulate the nasal mucosa to secrete substances, usually clear nasal mucus in the early stage, and mucus-like yellow nasal mucus in the later stage. 2. Sinusitis: mostly seen in staphylococcus, pneumococcus and other purulent cocci and other infections, caused by pediatric nasal mucosa expansion and congestion, slow movement of fibrous hairs, resulting in mucosal secretion of mucus, yellow nasal discharge. Pediatric yellow nasal discharge can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or treatment.