Why a Tear Duct Gets Blocked: How Watering, Discharge and Repeat Infections Develop

The wind on the walk to the car is the giveaway. One eye streams while the other stays perfectly dry, and by the time you reach the office the tissue in your coat pocket is damp. You are not crying, and nothing hurts. The eye simply will not stop overflowing.

A parent sees a different version of the same story: a baby whose left eye wakes up crusted shut every morning, wiped clean, sticky again by lunch. Two very different people, one shared question about blocked tear duct causes, and one shared frustration, because the eye looks otherwise healthy.

What links them is plumbing. The eye makes tears constantly and relies on a drain no wider than a piece of thread to carry them into the nose. When that drain narrows or closes, watering is only the first consequence. Discharge and, for some, a cycle of painful infections follow a predictable path, and understanding that path makes the choices ahead far less mysterious.

How the tear drain works, and where it can fail

Tears are not only for crying. A thin film of them coats the eye all day, made mostly by the lacrimal gland tucked under the outer part of the upper eyelid, along with tiny glands in the lids themselves. Each blink sweeps that film toward the inner corner of the eye and pumps it into the drainage system.

That system is small and surprisingly elaborate. Two pinhole openings called puncta sit on the inner edge of the upper and lower eyelids; a punctum is simply the entrance to the tear drain. From each punctum a short tube, the canaliculus, runs toward the nose. The two canaliculi merge and empty into the lacrimal sac, a soft pouch beside the bridge of the nose. From the bottom of that sac the nasolacrimal duct, the tear duct proper, travels down through bone and opens inside the nose. That is why a good cry ends with a runny nose: the tears have drained exactly where they were meant to go.

A blockage can sit at any point along this route, and the location shapes the symptoms. A narrowed punctum tends to cause watering alone, because nothing collects behind it. A blockage at the far end of the nasolacrimal duct leaves the lacrimal sac full of stale tears, and that stagnant pouch is where discharge and infection begin. The Mayo Clinic describes obstruction as either partial, where drainage is slow, or complete, where tears have nowhere to go at all.

Hold that picture of a pouch with a closed outlet in mind. Almost everything that follows, from the morning crust to the swollen, tender lump some adults develop, comes back to it.

Blocked tear duct causes: why the drain narrows or closes

Doctors sort blocked tear duct causes into two broad groups: those present from birth and those acquired later. The first group is about a channel that never fully opened. The second is about a channel that was open and then narrowed, scarred or was physically blocked.

The Mayo Clinic lists the main acquired causes. Age-related change is the most common: the puncta and the duct itself gradually narrow over the decades, much as older household pipes furr up. Chronic inflammation or infection of the eye, the tear sac or the nose can leave scar tissue that pinches the passage. Injury to the face, particularly a broken nose or fracture of the small bones near the inner eye, can distort or crush the duct. Nasal problems such as polyps or a deviated septum can press on the lower opening. Sinus or nasal surgery occasionally damages the duct on the way past. Some long-term eye drops, including some used for glaucoma, are associated with narrowing, as are certain chemotherapy medicines and radiation treatment directed near the face. Rarely, a growth in the nose or tear sac is the cause.

Notice what is on that list and what is not. Screens, reading, allergies to laundry powder and “weak eyes” do not appear. The tear duct is a physical conduit, and its problems are physical: a membrane that did not dissolve, a wall that thickened, a lumen filled with scar.

Cleveland Clinic adds a helpful framing: many adult blockages have no single identifiable trigger and are simply put down to gradual narrowing, a diagnosis of exclusion once injury, inflammation and growths have been ruled out. That uncertainty is normal, and it does not change the way the condition is managed.

Blocked tear duct in babies versus blocked tear duct in adults

The same drain fails for very different reasons at the two ends of life, and the outlook differs accordingly.

A blocked tear duct in babies is almost always a leftover from development. Late in pregnancy the nasolacrimal duct is sealed at its lower end by a thin membrane, sometimes called the valve of Hasner, which normally opens at or soon after birth. In some newborns it stays shut. Tears back up within the first weeks of life, one or both eyes water, and a yellowish crust gathers on the lashes. The baby is otherwise well, the white of the eye stays white, and feeding and sleep are unaffected. MedlinePlus notes that these congenital blockages usually open on their own, and the Mayo Clinic reports that most clear without any procedure during the first year of life.

A blocked tear duct in adults is a story of acquired narrowing. Cleveland Clinic and the Mayo Clinic both point to increasing frequency with age and to a higher rate in women, thought to relate to a naturally narrower bony channel. Adult blockages rarely reopen by themselves, because scar tissue and age-related thickening do not dissolve the way an infant’s membrane does. Symptoms also tend to be more troublesome: a watering eye that blurs vision in wind, recurrent sticky discharge, and in some people a tender swelling over the tear sac that signals infection.

Both groups share a subtle point. Neither is producing too many tears. A newborn’s eye and a sixty-year-old’s eye may be making perfectly normal amounts; the difference is that the tears are stuck at the exit. That is why treatments aimed at “drying” the eye miss the target entirely.

Why the eye waters when the problem is drainage, not tear production

Think of a sink with the tap running gently and the plug half in. Nothing dramatic happens for a while, then the water reaches the rim. The eye behaves the same way. Tears are produced steadily, the blink pumps them toward the drain, and when the drain cannot take them the lower lid fills like a tiny reservoir until it spills over onto the cheek. Doctors call this overflow epiphora, which just means tears running down the face without emotion behind them.

Wind, cold and bright light make it worse for a simple reason: they stimulate reflex tearing, briefly turning the tap up. A healthy drain copes with that surge. A narrowed one does not, so the overflow appears outdoors and settles indoors. People often conclude their eyes are “sensitive” when the real issue is capacity at the outlet.

The NHS points out that watering eyes can also be caused by the opposite problem, dry eye, in which an irritated surface triggers bursts of watery reflex tears. This is why a clinician will look at the whole system rather than assume. A blocked duct typically produces watering that is constant or worse in wind, often on one side, with a clear history of sticky discharge. Dry eye watering tends to come in waves, affects both eyes and brings grittiness. Telling them apart matters because the management is entirely different.

One more mechanism explains the blurring. A pool of tears sitting on the lower lid acts like a wobbly lens. Vision smears until you blink or dab, then sharpens again. Nothing in the eye itself has changed; the optics of the puddle have.

How discharge, crusting and repeat infections develop

Discharge is where the closed pouch starts to matter. Tears carry away dust, shed cells and the normal bacteria that live on the eyelids. In a working system that debris is flushed into the nose many times an hour. When the lower duct is blocked, the lacrimal sac becomes a cul-de-sac. Its contents sit, warm and undisturbed, and the mucus component thickens. Blinking or rubbing squeezes some of it back up through the puncta onto the lashes, where it dries into the crust that parents wipe away each morning.

Stagnation invites infection. The Mayo Clinic explains that a blocked duct allows bacteria to multiply in the trapped fluid, and MedlinePlus notes that infection of the tear sac, called dacryocystitis, is a recognized consequence. Dacryocystitis is simply an infected lacrimal sac; acute cases bring pain, redness and swelling over the inner corner of the eye and side of the nose, while chronic cases produce persistent mucus with little pain.

The reason infections repeat is the reason they start. An antibiotic course can clear the bacteria, but it does nothing to reopen the drain. The sac fills again, the same conditions return, and weeks or months later so does the infection. Cleveland Clinic describes this cycle as one of the main reasons adults are eventually referred for a procedure that restores drainage rather than another course of medicine.

There is a practical consequence for daily life, too. People with a chronically full sac often notice that gentle pressure at the inner corner of the eye brings up a bead of cloudy fluid. That is diagnostic in itself, and it is also a sign that squeezing, discussed later, should be left to the clinician.

Can a blocked tear duct be serious?

For most people, no. A blocked tear duct is a nuisance rather than a danger. Watering does not harm the eye, discharge does not threaten sight, and a newborn’s blocked duct is a benign wait-and-watch condition in the overwhelming majority of cases. That reassurance deserves to come first.

The exceptions all trace back to infection. When bacteria in the stagnant sac take hold and the wall of the sac becomes acutely inflamed, the result is acute dacryocystitis. The Mayo Clinic and MedlinePlus both describe the picture: a painful, red, swollen lump between the inner corner of the eye and the nose, sometimes with fever. Left untreated, that infection can form an abscess, occasionally break through the skin as a small draining channel called a fistula, or spread into the soft tissues around the eye. Infection spreading around the eye, known as periorbital or orbital cellulitis, is the genuinely serious outcome, because the orbit sits close to the brain and the eye’s own blood supply. It is uncommon, and it is why a swollen, hot inner eye corner is treated as an urgent problem rather than a wait-and-see one.

There is a second, rarer reason for caution. A blockage that appears in one eye of an adult with no history of infection or injury, especially with bloody tears or a firm mass, can occasionally signal a growth in the nose or sac. The Mayo Clinic lists tumors among the causes precisely so that clinicians remember to look. This is not a reason for alarm in the ordinary watery eye; it is a reason for a proper examination rather than years of dabbing.

So the honest answer sits in two parts: rarely serious, but with red flags that should never be ignored.

How doctors work out where the blockage is

Because the drain has several segments, the examination is a detective exercise in locating the narrowing. Most of it is quick and painless.

The first step is looking. An ophthalmologist, a doctor specializing in eye disease, inspects the puncta under magnification to see whether they are open, checks the lid position, because a lid that has sagged away from the eye can mimic a blocked duct, and presses gently over the lacrimal sac to see if fluid refluxes up through the puncta. Reflux of cloudy material is a strong hint that the blockage lies below the sac.

Next comes a dye test. A drop of orange fluorescein dye, harmless and widely used in eye clinics, is placed in each eye. The Mayo Clinic describes watching whether the dye clears from the eye over a few minutes and whether it can be found in the nose afterward. Dye that lingers in one eye and never reaches the nose points to obstruction on that side.

If the dye test is abnormal, the clinician may irrigate the system: a fine, blunt cannula is passed through a punctum and saline is flushed through. Fluid that flows into the throat means the channel is open; fluid that refluxes out of the other punctum means it is blocked below the junction. The pattern of reflux tells the examiner roughly where.

Imaging is reserved for unclear cases. Dacryocystography, an X-ray or CT taken after contrast is flushed through the duct, maps the anatomy, and a nasal endoscopy lets an ear, nose and throat surgeon inspect the lower opening directly. The Mayo Clinic notes these are used when surgery is being planned or an unusual cause is suspected, not for every watery eye.

How to unclog a tear duct at home: what helps, and should you squeeze it?

Search engines are full of promises about how to unclog a tear duct at the kitchen table. The evidence supports a much shorter list, and it differs sharply between infants and adults.

For babies, the mainstay is a specific massage, sometimes called the Crigler technique after the physician who described it. With a clean finger, a parent applies firm but gentle downward pressure along the side of the nose from the inner corner of the eye. The idea is to raise pressure inside the lacrimal sac so that it pushes against the sealed membrane at the bottom and helps it open. MedlinePlus and the Mayo Clinic both describe this as the first-line approach, alongside wiping away discharge with a warm, damp cloth so the lashes do not crust shut. The child’s clinician will demonstrate exactly where to press and how often; the technique matters more than enthusiasm.

For adults, massage has no comparable evidence, because the cause is scar or age-related narrowing rather than a membrane. Warm compresses and gentle cleaning of the lids can ease discomfort and reduce crusting, but nothing applied from outside reopens a scarred duct. The NHS notes that watering eyes often need no treatment at all if they are not troublesome, which is a legitimate choice for many adults.

Should you squeeze it? Not in the way most people mean. Pressing over the sac to see whether fluid comes out is something a clinician does deliberately, once, as a test. Repeatedly squeezing a swollen, tender sac at home risks spreading infected material into the surrounding tissue and can worsen an acute dacryocystitis. A firm lump that is red and painful is a reason to be seen, not massaged. Gentle massage of a soft, uninflamed sac in an infant, as taught, is different from squeezing an infected one in an adult.

Who is usually offered a procedure, and who is asked to wait

Not every blocked duct needs an intervention, and the decision rests on age, symptoms and the pattern of infection rather than on the blockage alone.

Infants are almost always asked to wait. Because most congenital blockages open spontaneously in the first year, MedlinePlus and the Mayo Clinic describe a period of observation with massage and cleaning, with a probing procedure considered if the blockage persists toward the first birthday or if repeated infections make waiting unreasonable. A baby whose sac becomes acutely infected, or whose eye is persistently red rather than merely sticky, moves up the list.

Adults with mild watering that bothers them only outdoors are often offered no procedure at all. The NHS position that watering eyes may not need treatment applies here; some people prefer a tissue to an operation, and that is a reasonable choice when infections are absent.

Adults are usually offered surgery when one of three things is true: the watering is constant and interferes with reading, driving or work; there have been repeated episodes of dacryocystitis; or a chronically full sac produces daily discharge. The Mayo Clinic describes dacryocystorhinostomy, a procedure that creates a new passage from the lacrimal sac into the nose, as the usual operation in this situation. Where the narrowing is partial or sits at the punctum, less invasive options such as widening the punctum or placing a temporary stent may be considered first.

People asked to wait for a different reason include anyone with an active acute infection, because surgeons generally prefer to settle infection before operating on the sac, and those whose blockage is thought to be caused by an ongoing medicine or a nasal condition that needs addressing first. The sequence, and whether to proceed at all, is set by the treating team.

Treatment options compared

The choices sit on a spectrum from doing nothing to a formal operation, and each suits a particular cause and stage. The table summarizes what the main sources describe; the right column is deliberately neutral, because the fit depends on the individual.

Approach	What it involves	Usually considered for	Points to know
Observation with massage and lid cleaning	Parent-applied pressure along the side of the nose; wiping crust with a warm cloth	Infants in the first year	Most congenital blockages open without a procedure in that time (Mayo Clinic)
Antibiotics	Eye drops or tablets chosen by the clinician for infection of the sac	Acute or chronic dacryocystitis at any age	Treats the infection, not the blockage; recurrences are common until drainage is restored
Probing	A thin metal probe is passed through the punctum and duct to open the membrane, usually under brief anesthesia in children	Infants whose blockage persists	Sometimes combined with irrigation; may be repeated
Balloon catheter dilation	A deflated balloon is threaded into the duct and inflated to stretch the narrowing	Children after failed probing; some adults with partial blockage	Outpatient procedure under anesthesia
Intubation or stenting	A fine silicone tube is left in the drainage system to hold it open	Partial blockages; alongside other procedures	Tubes are generally left for around three to six months (Mayo Clinic)
Dacryocystorhinostomy (DCR)	A new opening is made from the lacrimal sac into the nose, through a small skin incision or endoscopically through the nostril	Adults with complete blockage or recurrent infection	External approach leaves a small scar; the Mayo Clinic notes the endoscopic approach avoids the scar but has historically had somewhat lower success

Two observations cut across the table. First, only the procedures that physically reopen or bypass the duct address the underlying cause; everything else manages symptoms. Second, no row carries a percentage, because outcomes vary with cause, location of the blockage and surgeon, and the honest figure for any individual comes from the team examining them.

What the days and weeks after treatment usually look like

Recovery depends on which row of that table applies, and it is worth knowing the shape of each.

After probing or balloon dilation in a child, the day itself is the hardest part, mostly because of the brief anesthesia. Parents are often surprised at how quickly the watering settles once the drain is open, though a little blood-tinged tear or nasal discharge in the first day is common and expected. The clinician may prescribe antibiotic drops for a short period and will schedule a check to confirm the duct is draining; if watering persists, a repeat probing or a stent is discussed rather than assumed.

A silicone stent brings a different rhythm. The tube is barely visible as a tiny loop at the inner corner of the eye and is usually left, according to the Mayo Clinic, for around three to six months before removal in clinic. Rubbing the eye is discouraged during that time because the loop can be dislodged, and mild irritation is normal.

After dacryocystorhinostomy, the Mayo Clinic describes the early days as marked by nasal congestion, some bruising if the external approach was used, and instructions to avoid blowing the nose forcefully for a period so the new passage is not disturbed. Nasal sprays and drops are commonly prescribed to keep the opening clear; their type and duration are set by the surgeon. The small incision, if there is one, fades over months. Watering may take some weeks to settle fully as swelling around the new opening resolves, and a stent placed at surgery is removed at a later visit.

Across all of these, the pattern is the same: a short intense phase, a follow-up visit that checks drainage rather than just healing, and a candid conversation if the result is incomplete.

What people often get wrong about blocked tear duct causes

Myths gather around any condition that is common, visible and rarely dangerous. These are the ones clinicians hear most.

“My eyes make too many tears.” Almost never the problem. Production is usually normal; the outlet is not. Treatments aimed at reducing tears, or at “strengthening” the eyes, have no mechanism to act on a narrowed duct.

“It’s conjunctivitis that won’t clear.” Conjunctivitis, inflammation of the membrane covering the white of the eye, makes the eye red and often affects both sides. A blocked duct typically leaves the white of the eye white, favors one side and produces discharge that returns within hours of wiping. Parents of infants are often treated for pink eye several times before the drain is examined.

“Screens or reading caused it.” There is no evidence linking visual tasks to duct narrowing. The Mayo Clinic’s list of causes is anatomical: age, inflammation, injury, nasal disease, certain treatments and, rarely, growths.

“Antibiotics fix it.” They treat the infection in the sac. They cannot dissolve scar tissue or open a membrane, which is why the same infection tends to return until drainage is restored.

“It will heal itself if I leave it long enough.” True for most infants within the first year, according to the Mayo Clinic and MedlinePlus. Largely untrue for adults, whose blockages are structural.

“Squeezing it out clears the blockage.” Expressing the sac empties it temporarily and does nothing to the duct below. Squeezing an inflamed sac risks pushing infection into surrounding tissue.

“It’s only cosmetic.” For some people it is a minor nuisance. For others, blurred vision in wind, daily discharge and painful infections are genuinely disabling, and those effects are a legitimate reason to seek treatment rather than a vanity.

Questions to ask your care team

A watery eye is easy to dismiss in a busy clinic, and a prepared patient gets more from the appointment. These questions steer the conversation toward cause and choice rather than reassurance alone.

• Where exactly is the blockage, and is it partial or complete? The answer determines whether a minor procedure or a formal operation is even relevant.
• Is there anything about my history, an old nose injury, sinus surgery, a long-term eye drop, that you think caused this? Knowing the cause sometimes changes the plan.
• For a baby: how will we know the massage is working, and at what point would you consider probing rather than continuing to wait?
• If I do nothing, what is likely to happen over the next year? For many adults without infections, the honest answer is very little, and that is useful to hear.
• How many episodes of infection would make you recommend a procedure sooner?
• If surgery is suggested, which approach are you proposing and why, and what would the alternative involve?
• What does recovery look like in my case, and what should I avoid doing in the first weeks?
• What are the specific risks for me, including the chance the watering does not fully resolve?
• Are there signs that mean I should call urgently rather than wait for my next appointment?
• Does anything about this picture need a look inside the nose or imaging before we decide?

Write the answers down. The anatomy is small and the terminology unfamiliar, and it is far easier to weigh a decision at home with a clear note of what was said than to reconstruct it from memory. Bring the list back to the follow-up; the questions that matter most often change once the first results are in.

When to call your doctor

Most people with a blocked tear duct can arrange a routine appointment and be seen without urgency. A few situations should not wait, because they signal that the stagnant sac has become an active infection or that something other than a simple blockage is going on.

Contact your doctor or seek urgent care the same day if you or your child develop any of the following:

• A red, hot, swollen or tender lump between the inner corner of the eye and the side of the nose, which the Mayo Clinic and MedlinePlus describe as the hallmark of acute dacryocystitis.
• Fever alongside eye swelling, or a child who is unusually drowsy, irritable or feeding poorly.
• Redness and swelling spreading across the eyelids or onto the cheek, or an eye that is difficult to open because of swelling.
• Pain when moving the eye, double vision, or any drop in vision, which can indicate infection spreading behind the eye and needs emergency assessment.
• Pus or blood draining from the skin near the inner eye, suggesting an abscess or fistula.
• Blood-stained tears, or a firm lump near the tear sac in an adult with no history of infection.
• After a procedure: heavy or persistent bleeding from the nose, worsening pain, a stent loop that has pulled out or is scratching the eye, or a fever.

For a newborn, an eye that is sticky but with a white eyeball and a settled baby can usually wait for a routine check. An eye that is red, a lid that is swollen, or a baby who seems unwell should be seen promptly. Trust the pattern: watering and crust are the blockage; heat, swelling, spreading redness and fever are the infection, and infection near the eye is treated as urgent. Whatever the setting, the treating team decides what happens next.

Frequently asked questions

How do you unclog your tear ducts?

In infants, a clinician-taught massage along the side of the nose combined with gentle warm-cloth cleaning is the standard first step, and most congenital blockages open on their own within the first year. In adults, nothing applied from outside reliably reopens a scarred or narrowed duct; warm compresses ease crusting but do not treat the cause. Persistent or infected blockages are addressed with probing, dilation, stenting or surgery chosen by the treating team.

Should you squeeze a blocked tear duct?

Not as a home remedy. A clinician may press gently over the tear sac once to see whether fluid refluxes, which helps locate the blockage, but repeatedly squeezing a swollen or tender sac risks pushing infected material into the surrounding tissue and worsening an acute infection. The gentle downward massage taught for infants is different from squeezing an inflamed lump, and any red, painful swelling near the inner eye should be examined rather than pressed.

Can a blocked tear duct be serious?

Usually it is a nuisance rather than a danger, but complications come from infection. Bacteria in the stagnant sac can cause acute dacryocystitis, a painful red swelling near the nose, which can progress to an abscess or, uncommonly, spread into the tissues around the eye. That spread is the genuinely serious outcome and needs urgent treatment. A one-sided adult blockage with bloody tears or a firm mass also warrants prompt assessment to exclude a rare growth.

Can a blocked tear duct heal itself?

In babies, yes, most of the time. The Mayo Clinic and MedlinePlus note that congenital blockages usually open without any procedure during the first year as the membrane at the bottom of the duct gives way. In adults the answer is generally no, because the cause is scar tissue, age-related thickening or a structural problem in the nose, none of which dissolves on its own. Mild adult watering can be tolerated, but the blockage itself tends to persist.

Why does a blocked tear duct cause watering instead of dry eyes?

Because tear production is normal; only the drainage has failed. Tears are made continuously and pumped by each blink toward the inner corner of the eye. When the duct cannot carry them away, they pool on the lower lid and spill over onto the cheek, especially in wind or cold when reflex tearing briefly increases flow. Paradoxically, dry eye can also cause watering through irritation-driven reflex tears, which is why a clinician checks both possibilities.

Why does my baby's eye keep getting sticky even though it isn't red?

That pattern is typical of a congenital blocked tear duct rather than conjunctivitis. Tears and mucus collect in the sac because the lower end of the duct has not opened, and blinking pushes the stale material back onto the lashes where it dries into crust. The white of the eye stays white and the baby is well. Redness, lid swelling or a hot lump near the nose would suggest infection and should be seen promptly.

Is a blocked tear duct contagious?

No. The blockage is a physical narrowing or closure of the drainage channel and cannot be passed to anyone. The discharge it produces contains ordinary skin and eyelid bacteria that have multiplied in trapped fluid, not a spreading infectious agent in the way viral conjunctivitis is. Basic hygiene, such as washing hands and using a clean cloth for each wipe, is sensible mainly to avoid introducing extra bacteria into an already stagnant sac.

Why do blocked tear ducts keep getting infected after antibiotics?

Antibiotics treat the bacteria in the tear sac but do nothing to reopen the duct beneath it. Once the course ends, the sac refills with stagnant tears and mucus, the same warm, undisturbed conditions return, and bacteria multiply again. Cleveland Clinic describes this repeating cycle as one of the main reasons adults are eventually referred for a procedure that restores or bypasses drainage, because only restoring flow removes the environment that breeds infection.

What is the difference between a blocked tear duct and conjunctivitis?

Conjunctivitis is inflammation of the thin membrane covering the white of the eye; it makes the eye pink or red, commonly affects both sides and often follows a cold or exposure to an infected person. A blocked tear duct leaves the white of the eye clear, usually affects one side, and produces watering plus discharge that returns within hours of wiping. Many people, particularly infants, are treated for pink eye more than once before the drainage system is examined.

Do blocked tear ducts in adults come back after treatment?

They can, and the likelihood depends on the cause, the location of the blockage and the procedure used. Scar tissue can re-narrow a passage opened by probing or dilation, which is one reason stents are sometimes left in for months, and a surgically created opening can occasionally close over. The Mayo Clinic notes that the endoscopic approach to dacryocystorhinostomy has historically had somewhat lower success than the external approach. Your surgeon can explain the realistic expectation for your particular anatomy.

References

• MedlinePlus – Blocked tear duct
• NHS – Watering eyes

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.