Children with yellow nasal discharge in the morning are commonly affected by colds combined with bacterial infections and sinusitis. 1. Colds combined with bacterial infections: children’s colds are often caused by viral infections, nasal congestion, runny nose, low-grade fever, cough and other symptoms, if combined with bacterial infections, such as pneumococcus, staphylococcus aureus, hemolytic streptococcus and so on, can cause yellow runny nose. 2. Sinusitis: the common cause of children with yellow runny nose is also sinusitis, which can be accompanied by turbinate hypertrophy, nasal mucosal congestion, headache, dizziness and other symptoms, which can be diagnosed by taking sinus CT, rhinoscopy and so on. Children with yellow nasal discharge in the morning, there may be other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment, the above medication to follow the doctor’s instructions.