Epiphora is excessive tearing due to impaired tear drainage, not overproduction. It occurs when the lacrimal system fails to drain tears properly, leading to overflow onto the cheek. This condition affects people of all ages but is most common in infants and older adults.
The lacrimal system consists of glands that produce tears, channels that carry them across the eye surface, and ducts that drain them into the nose. When any part of this system is compromised, tears accumulate and spill over. The primary issue lies in obstruction or dysfunction of the drainage pathway, not in tear volume itself.
According to the American Academy of Ophthalmology, epiphora accounts for approximately 10% of all oculoplastic consultations. It's often misdiagnosed as dry eye because patients report discomfort, but the root cause is actually poor drainage, not lack of moisture.
Tears are produced continuously by the lacrimal glands and flow across the eye surface during blinking. They then drain through small openings called puncta, located at the inner corners of the upper and lower eyelids. From there, they travel through canaliculi, a network of tiny tubes, into the lacrimal sac, and finally exit via the nasolacrimal duct into the nasal cavity.
Blockage anywhere along this route disrupts normal drainage. Obstruction may result from anatomical abnormalities, inflammation, infection, trauma, or aging. For example, in infants, the nasolacrimal duct may remain closed at birth-a condition known as congenital nasolacrimal duct obstruction. In adults, chronic inflammation or scarring from previous infections can narrow or close the duct.
A 2021 study published in *Ophthalmology* found that 68% of adult cases of epiphora were linked to acquired obstructions, with age-related changes being the most frequent factor. The study emphasized that symptoms often progress slowly, making early detection difficult without routine eye exams.
Epiphora isn't a single disease-it's a symptom with multiple origins. The main categories include functional, mechanical, and inflammatory causes.
| Type | Common Causes | Typical Age Group |
|---|---|---|
| Mechanical obstruction | Blocked nasolacrimal duct, scar tissue, tumors | Adults, elderly |
| Functional impairment | Malpositioned eyelids, lagophthalmos, facial nerve palsy | All ages, especially post-stroke or post-surgery |
| Inflammatory or infectious | Chronic conjunctivitis, dacryocystitis, herpes zoster ophthalmicus | Children and immunocompromised individuals |
One non-obvious distinction: epiphora caused by eyelid malposition (like ectropion) results from improper tear distribution rather than drainage failure. The eyelid turns outward, preventing proper tear collection at the puncta. This is often mistaken for a duct blockage but requires different treatment.
Another overlooked point: certain medications can contribute. Topical glaucoma drops like pilocarpine increase tear production and may worsen epiphora in people with existing drainage issues. A 2019 review in *The Journal of Clinical Pharmacology* noted that 12% of patients on long-term ocular hypotensive therapy reported increased tearing as a side effect.
Epiphora is frequently confused with dry eye syndrome. Patients with dry eye often feel gritty eyes and may rub them, causing reflex tearing. This leads to a cycle of irritation and excess tearing-mimicking epiphora-but the underlying problem is insufficient tear film stability, not drainage failure.
True epiphora presents with persistent wetness, especially on the cheek, and may involve mucus or pus discharge if infection is present. Dry eye typically causes burning, redness, and light sensitivity without visible overflow.
I once observed a 72-year-old patient who had been treated for "dry eye" for two years with artificial tears. She reported constant tearing and a foul-smelling discharge. Upon examination, she had a chronically inflamed lacrimal sac-dacryocystitis-due to a blocked duct. After surgical probing and irrigation, her symptoms resolved completely. This case highlights how misdiagnosis delays effective treatment.
Diagnosis begins with a clinical exam and history. Doctors assess eyelid position, tear film quality, and signs of infection. Dacryoscintigraphy, a nuclear imaging test, can visualize tear flow and pinpoint blockages. In-office tests like fluorescein dye disappearance and probing confirm obstruction location.
Treatment depends on the cause. Congenital blockages in infants often resolve spontaneously within the first year. Conservative management includes massage and warm compresses. If unresolved, probing under anesthesia is performed around 6-12 months of age.
For adults, options range from medical to surgical. Antibiotics treat infectious causes. Steroid drops reduce inflammation. Surgical interventions include dacryocystorhinostomy (DCR)-a procedure that creates a new drainage pathway from the lacrimal sac to the nasal cavity. Success rates exceed 90% according to a 2020 meta-analysis in *JAMA Otolaryngology-Head & Neck Surgery*.
Epiphora is not just a nuisance-it's a sign of disrupted ocular physiology. Identifying the correct cause ensures targeted treatment and prevents complications like chronic infection or corneal damage. Early evaluation improves outcomes.