Children’s eye secretion of yellow mucus may be caused by bacterial conjunctivitis, dacryocystitis, keratitis and so on. 1. Bacterial conjunctivitis: when children use their eyes unhygienically, it may lead to bacterial infection of the conjunctiva, resulting in the secretion of yellow mucus, which may be accompanied by symptoms such as conjunctival congestion and tearing. 2. Dacryocystitis: When the nasolacrimal duct is narrowed or blocked, the tear fluid is retained in the lacrimal sac, which will cause irritation to the mucous membrane of the lacrimal sac, resulting in inflammation, leading to the secretion of yellow mucus in the eyes, which may be accompanied by redness, swelling and pain in the lacrimal sac area, and other symptoms. 3. Keratitis: When keratitis is induced by endogenous or exogenous adverse factors, it can lead to tearing, photophobia, eye pain and other discomforts. If it is caused by infection, it may lead to more purulent secretions, manifesting itself as the secretion of yellow mucus from the eyes. Parents should bring their children to the hospital in time to see a doctor for a clear cause of the yellow mucus discharge from the eyes of children.