The common causes and treatments of yellow nasal discharge in young children include:1. Young children with paranasal sinusitis will have yellow nasal discharge, which can be aggravated by colds, inhalation of dust and fur, and avoiding contact with particles and objects that can irritate young children’s respiratory tracts.2. Children with enlarged lymph glands will have yellow nasal discharge, which is accompanied by symptoms such as a flat nose, stagnant face and snoring, and need to be examined in the hospital for a clear diagnosis. 3. 3, when a child has a cold will flow yellow snot, can occur in the cold can also occur in the cold relief period, there is no special significance, the color of the snot and the bacteria, viruses or mycoplasma infected with inflammatory reaction of the metabolites related to. 4, the young children’s nasal cavity is immature, easy to be infected by the outside world invasion, but also prone to flow yellow snot.