Constantly watery eyes that are not from crying: could it be a blocked tear duct?

A constantly watering eye is easy to apologise for, and a common line is "I promise I am not crying, it just will not stop." It is natural to try different eye drops, to wonder about allergies, or to worry quietly that low mood is showing on your face. A look at the inner corner of the eye usually gives a much simpler answer than any of that. The tears are fine. The drain is blocked.

Watery eyes, epiphora in medical language, is one of the most common reasons adults and small children end up in an eye clinic, and one of the most misunderstood. Everyone assumes too much water is being made. Far more often, the eye is making a perfectly normal amount and simply cannot get rid of it.

Why does my eye keep watering when nothing is wrong with it?

Because watering is not always about production, it is about plumbing. Every blink sweeps tears across the eye and pumps them toward two tiny openings at the inner corner of each eyelid, called the puncta. From there they travel down a short canal into the lacrimal sac, then through the nasolacrimal duct, the drainage tube that runs from the corner of your eye down into your nose. That is also why a good cry makes your nose run. It is the same plumbing.

If any part of that route narrows or closes, tears that are being made normally have nowhere efficient to go, and they overflow onto the cheek instead. Doctors call this an outflow problem, and it accounts for the majority of persistently watery adult eyes. The confusing part is that an irritated, dry eye surface can also cause reflex watering, so a watery eye and a dry eye can, paradoxically, be the same patient. Getting the two apart is the entire point of the examination, because treating one when the other is the real problem changes nothing. The questions that tell too many tears from poor drainage are set out in watery eyes in adults: too many tears or poor drainage.

1. 1Lacrimal gland. Sits at the outer upper corner of the eye socket and makes most of the watery part of tears.
2. 2Punctum. A tiny opening on the inner edge of each lid margin, one on the upper lid and one on the lower, where tears enter the drainage system.
3. 3Canaliculi. Short narrow channels that carry tears from each punctum inward, joining into one common channel before the lacrimal sac.
4. 4Lacrimal sac. A small reservoir beside the nose that collects tears before they drain further down.
5. 5Nasolacrimal duct. A channel running down from the sac towards the inside of the nose.
6. 6Opening into the nose. Where the duct empties, under a ridge of tissue called the inferior turbinate. This is why crying can also make the nose run.

What actually causes a blocked tear duct?

In adults, the most frequent finding is simple age-related narrowing of the nasolacrimal duct, and the honest position is that we do not fully understand why some ducts narrow and others do not. Previous sinus surgery or sinus disease, nasal trauma, radiotherapy near the face, certain chemotherapy drugs, and inflammatory conditions of the eyelid or nose can all scar the passage. A lower eyelid that has sagged outward, a condition called ectropion, or one that has turned inward and rubs the eye, a condition called entropion, can also stop tears reaching the punctum in the first place even when the duct itself is open. Position matters as much as patency. Age can also narrow the tiny opening at the start of the drain, which is punctal stenosis, and a cut through the inner corner can divide the canal itself, which is why an eyelid or tear duct cut needs an eye specialist.

Occasionally the story is not a blockage of the drainage tube at all. A chalazion or eyelid lump near the inner corner can press on the system, which is one reason the lids should be examined as a whole rather than the duct in isolation. If you have noticed a firm bump on the lid alongside the watering, it is worth reading about what a chalazion actually is and how it differs from a stye, because the two are frequently confused and treated differently.

My baby's eye has watered since birth, is this the same thing?

It is related but usually far simpler. Many babies are born with the lower end of the nasolacrimal duct not yet fully open, a thin membrane left over from development that has not broken through. This causes watering and sometimes mild crusting from very early on, and in the great majority of infants it resolves by itself within the first year as the duct finishes maturing. Gentle massage over the tear sac, shown to parents by their paediatrician or eye doctor, can help the membrane open sooner.

What it should not cause is a red, swollen, tender lump near the nose, or thick discharge with inflamed surrounding skin. That combination points toward infection rather than simple overflow and needs assessment rather than watchful waiting. Paediatric lacrimal problems were the subject of research I contributed during my fellowship, reviewing a decade of children treated surgically for duct blockage at a UK tertiary centre, and one lesson from that work stayed with me: most children never need an operation, but the small number who do should not be left drifting past their second birthday on the assumption that time alone will fix it. If your child's watery eye is a live concern, my colleague Dr Chan has written a fuller guide for parents on watery eyes and blocked tear ducts in children on Little Eyes 101.

When does a watery eye need urgent attention rather than a routine appointment?

When the inner corner becomes red, swollen and painful, because that can mean the tear sac itself has become infected, a condition called dacryocystitis. Pressing gently near that corner and seeing cloudy or pus-like fluid come back through the punctum is another clear sign. Fever, spreading redness of the lid, or pain that worsens over hours rather than settling should not wait for the next available slot.

Acute infection around the tear sac and the lacrimal gland above it can look alarming and can genuinely progress quickly if untreated, which is why any hot, tender lump near the inner eye deserves to be taken seriously rather than assumed to be a stye. I have written up a case of acute dacryoadenitis, inflammation of the lacrimal gland itself, precisely because the swelling it causes can be mistaken at first glance for a blocked duct, and telling the two apart changes the treatment completely. A single red, sticky eye that does not clear with antibiotic drops can also be canaliculitis, an infection of the tiny canal in the lid that is often mistaken for conjunctivitis.

How do you actually work out where the blockage is?

By examination first, then with fluid. The position of the eyelids and puncta is checked, because a punctum that is not sitting against the eye cannot collect tears no matter how open the duct behind it is. A small amount of sterile saline is then usually syringed gently through the punctum and canal, to feel and see where it stops, whether it passes freely into the nose, or whether it regurgitates back out. This single test, done in clinic, shows a great deal about where along the route the problem sits.

For some patients a dye disappearance test is added, to see how quickly a drop of coloured dye clears from the tear film, or imaging is arranged to map the duct in more detail before planning surgery. The aim is always the same: know exactly where the obstruction is before proposing to bypass it.

What treatment actually fixes a blocked tear duct?

Eye drops do not, and it bears repeating. Drops soothe an irritated surface or treat a secondary infection, but they cannot mechanically open a narrowed tube any more than they could clear a blocked drainpipe under a sink. When the blockage is mild or partial, some adults manage well with lubricating drops for the associated irritation and simply live with intermittent overflow, and that is a reasonable choice if the watering is not troubling them. Whether massage or a warm compress helps an adult duct is a separate question, answered in blocked tear duct in adults: does massage or a warm compress help.

When symptoms are persistent or there has been infection, the definitive treatment is DCR, short for dacryocystorhinostomy, an operation that creates a new drainage channel directly from the tear sac into the nose, bypassing the narrowed segment altogether. It can be done through a small incision beside the nose, which heals to a fine line, or entirely from inside the nostril using an endoscope, leaving no visible mark at all. A soft stent is often left in place for some weeks to keep the new channel open while it heals. Most adults have this as a day case under general or local anaesthetic with sedation, and recovery from the surgery itself is generally straightforward, though healing of the new channel continues for longer than the visible healing of any incision. What happens during the operation, the tubes and the recovery are set out in DCR surgery: what happens and what recovery involves.

One question worth asking, particularly for anyone who has researched their own condition thoroughly, is whether DCR should be done while the duct is acutely infected or only once the infection has settled. I argued the case for operating during acute dacryocystitis, rather than waiting, in a formal debate at a regional surgical conference, and it remains a genuinely contested point among oculoplastic surgeons rather than a settled one. The honest answer for any individual patient depends on how unwell they are, how the anatomy looks, and how quickly a slot can safely be arranged, which is a conversation rather than a rule.

What should I do while I am waiting to be assessed?

Keep the skin at the inner corner and cheek clean and dry to prevent irritation from constant wiping, and use a preservative-free lubricating drop if the eye itself feels sore rather than simply wet, since the two sensations call for different care. Do not start antibiotic drops on your own for ordinary watering, since they will not touch a mechanical blockage and can mask a developing infection instead of treating it. And do not assume a watery eye is trivial simply because it is common. It sits on the same list of causes I cover in my broader piece on what actually makes eyes look tired, because a constantly damp, reddened lower lid ages a face in the mirror just as surely as it soaks a tissue. You can read more about these conditions in the watery eyes and blocked tear ducts section, or bring the tissue to an eye specialist and find out, properly, why it is there.