Pediatric lacrimal duct obstruction mainly manifests as tearing or eye containing tears, eyes with mucus overflow. The hazards can be summarized as follows: 1, periocular skin eczema: children’s facial skin is delicate, tears stimulate the skin around the eyes will appear red rash, erosion, itching, long time to cure. 2, dacryocystitis: simple tear duct obstruction may have clear mucus outflow, no pus overflow. However, the tear ducts are not accessible, and the accumulation of tears in the tear sacs is very easy to secondary infection to appear dacryocystitis. In this case, there will be purulent fluid outflow or purulent eye mucus. Without timely treatment, the tear sac and tear duct mucosa appear inflammatory reaction, making it easy to block again after the tear duct exploration. 3, tension tear overflow: tear duct inaccessible, long-term accumulation of tears, mucus and even pus in the tear sac, making the expansion of the tear sac lose elasticity and tear drainage, even if the tear duct is opened, it will cause tension tear due to the weakness of the tear sac contraction. 4, keratitis: when the tear duct obstruction has appeared after the dacryocystitis and no timely treatment, once the cornea (black eye) has minor trauma such as corneal foreign body, nail scratches, forceful eye rubbing, etc., the bacteria discharged from the tear sac will invade the cornea and lead to keratitis. Severe keratitis will leave a permanent scar on the cornea and affect vision. 5, orbital cellulitis: when the lacrimal sac bacteria are virulent and the body’s resistance is low, the bacteria will cause acute inflammation of the lacrimal sac, resulting in redness, swelling, hardness and pain in the lacrimal sac area. The inflammation can spread to the surrounding tissues leading to orbital cellulitis or even life-threatening intracranial infection. 6. Aesthetic and psychological impact: The aesthetic and psychological impact of persistent tearing is evident in older children. Children are often reluctant to look up, meet and communicate with others, resulting in decreased self-confidence and isolation. Knowing the above dangers, parents should not think that tears are irrelevant. If you find that your child has tears, you must go to a regular hospital for active treatment.