A 7 year old child always running a yellow nose may be caused by chronic rhinitis, chronic sinusitis, upper respiratory tract infections and other reasons. 1. Chronic rhinitis: chronic rhinitis patients due to persistent and repeated nasal infection, infection caused by inflammation stimulation leads to increased nasal secretions, which leads to 7-year-old children always run yellow nose. 2. Chronic sinusitis: chronic sinusitis is a chronic inflammation that occurs in the sinuses, chronic sinusitis can cause inflammatory cell infiltration and increase the number of mucus glands, resulting in increased purulent secretions in the sinuses. The sinuses are also connected to the nasal cavity, and the purulent secretions in the sinuses can flow out of the nasal cavity. Therefore, the chronic sinusitis of 7-year-old children can always have the performance of yellow nasal discharge. 3. Upper respiratory tract infection: Upper respiratory tract infection causes an increase in respiratory secretions, and the secretions caused by bacterial infections are generally thicker. Therefore, when the upper respiratory tract bacterial infection, 7-year-old children can always have the symptom of yellow nasal discharge. The 7-year-old child is always running yellow nose, there may be other reasons, should go to the hospital in time, improve the relevant examination, clear cause to give targeted treatment.