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

The person in front of me is usually holding a damp tissue and apologising for it. "I promise I am not crying," they say, "it just will not stop." They have tried three brands of eye drops, they have wondered about allergies, and one or two have quietly worried they are depressed and it is showing on their face. Then I look at the inner corner of the eye, and the answer is usually much simpler 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 my 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 I see. 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.

What actually causes a blocked tear duct?

In adults, the most frequent finding is simple age-related narrowing of the nasolacrimal duct, and I am honest with patients 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.

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 I always examine the lids 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 I take any hot, tender lump near the inner eye seriously rather than assuming it is 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.

How do you actually work out where the blockage is?

With my hands first, then with fluid. I examine the position of the eyelids and puncta, because a punctum that is not sitting against the eye cannot collect tears no matter how open the duct behind it is. I usually then syringe a small amount of sterile saline gently through the punctum and canal, feeling and watching where it stops, whether it passes freely into the nose, or whether it regurgitates back out. This single test, done in clinic, tells me a great deal about where along the route the problem sits.

For some patients I add a dye disappearance test, watching how quickly a drop of coloured dye clears from the tear film, or imaging that maps 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 I say this often enough that I no longer feel repetitive saying it. 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.

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.

One question I am asked surprisingly often, usually by patients who have 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 the conditions I treat in the tear duct and drainage clinic, or bring the tissue with you and let us find out, properly, why it is there.