Causes of Nasolacrimal Duct Obstruction

Caring for newborns is the most challenging task for new mothers. First, infants’ organs are still immature at this stage, and they cannot verbally express their needs—crying is their only means of communication. Parents must therefore patiently “interpret” these cries. Second, illnesses can cause significant harm to infants; nasolacrimal duct obstruction is one such condition that warrants early detection and intervention to minimize the infant’s discomfort.

Causes of Nasolacrimal Duct Obstruction

Congenital: Approximately 2–6% of newborns develop excessive tearing (epiphora) with increased mucoid discharge within several weeks after birth. This is commonly due to a persistent membranous obstruction at the distal end of the nasolacrimal duct, which fails to open spontaneously. The obstruction may occur unilaterally or bilaterally. Fortunately, the majority of affected infants experience spontaneous resolution within six months; only a small minority require surgical intervention. The incidence is equal between males and females, with no clear genetic predisposition.

Acquired: This form occurs more frequently in adults—especially middle-aged and elderly individuals—and may result from trauma, or chronic inflammation of the eyelids, conjunctiva, or nasal mucosa. In severe cases, complete duct obstruction may occur.

Other Causes of Epiphora (Excessive Tearing)

The eyes are highly sensitive organs. Aside from nasolacrimal duct obstruction, another major cause of epiphora is excessive tear production. External stimuli can trigger reflexive lacrimation. Common underlying causes include dry eye syndrome, conjunctivitis, intraocular foreign bodies, trichiasis (in-turned eyelashes), and eyelid disorders. A thorough differential diagnosis is essential to exclude these other potential causes before initiating systematic treatment specifically targeting nasolacrimal duct obstruction.

The specific treatment approach for nasolacrimal duct obstruction depends on the child’s age. Treatment options are not standardized and must be carefully selected based on the individual infant’s clinical presentation. Throughout this process, parental patience, active cooperation with the physician’s treatment plan, and diligent post-treatment care are vital to achieving optimal and timely recovery.