The cause of fever and yellow nasal discharge in children may be acute rhinitis, or acute sinusitis. 1. Acute rhinitis: viral infection causes acute inflammation of the nasal mucosa, when secondary bacterial infection, in addition to viral infection caused by nasal congestion, runny nose, fever and other symptoms, but also lead to nasal mucus becomes mucopurulent or purulent. 2. Acute sinusitis: acute sinusitis is mostly caused by purulent bacterial infection, often secondary to acute sinusitis, children can have fever, yellow nasal discharge, nasal congestion, headache and other symptoms. Children with fever, yellow nasal discharge, there may be other reasons, 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.