A child with constantly watery eyes is often assumed to have an allergy or an eye infection. Many parents try allergy drops, wipe the eyes frequently or wait for the problem to settle on its own. While allergies are certainly common, persistent watering in infants and young children often has a very different explanation—one that has nothing to do with allergies at all.
One of the most common causes is a blocked tear duct, also known as congenital nasolacrimal duct obstruction. It is a condition that ophthalmologists see regularly during infancy, yet many parents are unfamiliar with it.
How the tear drainage system works
Tears do much more than express emotions. They keep the surface of the eye moist, wash away dust and help protect against infection. After spreading across the eye, tears normally drain through tiny openings in the inner corner of the eyelids before passing into the nose through the tear duct.
In some babies, this drainage pathway does not open completely at birth. Tears are produced normally, but they cannot drain away efficiently. As a result, they collect on the surface of the eye and frequently spill over onto the cheeks.
Parents often notice that one eye seems constantly watery, even when the child is not crying. The eyelashes may remain damp, and there may be a sticky or yellowish discharge, particularly after the baby wakes up. Although this can resemble conjunctivitis, the white part of the eye usually remains clear rather than red.
Why early diagnosis matters
The reassuring news is that most blocked tear ducts improve on their own during the first year of life as the drainage system matures. Gentle massage over the tear sac, performed correctly after guidance from an ophthalmologist, can help encourage the duct to open naturally in many infants.
However, persistent watering should never be dismissed without an examination. Recurrent stagnation of tears can occasionally lead to infections of the tear sac, causing redness, swelling and tenderness near the inner corner of the eye. Such infections require prompt medical attention.
Importantly, not every watering eye is caused by a blocked tear duct. Less commonly, excessive tearing may signal conditions such as childhood glaucoma, which is an eye emergency. Babies with glaucoma often develop watering along with marked sensitivity to light, frequent eyelid squeezing and enlargement or clouding of the cornea. Although uncommon, recognising these warning signs early can protect vision.
When to seek help
Parents should arrange an eye examination if watering persists beyond a few weeks, is associated with recurrent discharge, or if the eye appears red, swollen or painful. Medical attention is also important if the child seems uncomfortable in bright light or if there are concerns about vision.
If a blocked tear duct has not resolved by around 9 to 12 months of age, an ophthalmologist may recommend a simple procedure called probing, in which the blocked passage is gently opened. It is a brief procedure with a high success rate in appropriately selected children.
Children rub their eyes for many reasons, and not every watery eye points to an allergy. While allergic eye disease usually causes intense itching, watering due to a blocked tear duct is primarily a drainage problem. Understanding this difference helps parents seek the right care instead of relying on repeated courses of eye drops that may not address the underlying issue.
A child's eyes are still developing in the early years, so it's worth paying attention to symptoms that don't go away. Persistent watering is often caused by a simple, treatable problem, but it's always better to have it checked than to assume it will settle on its own.
(The author is a consultant ophthalmologist, glaucoma & cataract surgeon at Arete Hospitals, Hyderabad)
The opinions expressed in this article are those of the author and do not purport to reflect the opinions or views of THE WEEK.
