Fever in children is usually caused by viral infections. The eye and nasal cavity are connected through the nasolacrimal duct, and inflammation may spread down the nasolacrimal duct to the eye, causing viral conjunctivitis, which manifests itself in symptoms such as congestion and increased watery discharge. It is usually caused by rhinovirus, adenovirus, respiratory syncytial virus, and influenza virus infection, and can be treated with antiviral drugs. If there is yellow purulent discharge, usually staphylococcus aureus infection, with antibiotic eye drops treatment, do not rub the eyes.