Why Do Our Eyes Water When We Yawn
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You yawn, and your eyes water. It happens so often that most people never stop to ask why. A big yawn stretches your jaw wide open, you take in a deep breath, your eyes squeeze shut for a second, and when you open them again, there are tears sitting in the corners, or even running down your cheek. It can happen in the morning when you wake up, in the afternoon when you are tired, during a long meeting, or while you are watching someone else yawn. It is such an ordinary experience that it feels strange to write a whole article about it, but the reason behind it is genuinely interesting, and it tells you something useful about how your eyes and your face work together.
The short answer is that a yawn squeezes the muscles around your eyes, and those muscles press on the tear glands, which then release extra tears. It is a mechanical effect, a bit like squeezing a sponge. But the full answer is a little richer than that, because yawning also changes the pressure inside your head, it changes how you blink, it happens most when you are tired, and tired eyes are already drier and more sensitive than rested eyes. All of these things add up, and the result is that a good, wide yawn very often ends with watery eyes. This article explains each part of that in plain words, so the next time it happens to you, you will know exactly what your body just did.
What a Yawn Really Is
A yawn is a reflex, which means your body does it on its own, without you deciding to do it. It starts with a slow, deep breath in, your mouth opens wide, your jaw stretches, and then you breathe out slowly. The whole thing takes about five or six seconds. You can try to stop a yawn once it has started, but it is very hard, because the reflex is strong and it runs on its own. Babies yawn before they are born, and almost every animal with a backbone yawns too: dogs, cats, birds, even fish. It is one of the oldest and most basic things the body does, and scientists are still not completely sure why we do it.
The most common explanation is that yawning helps to wake the brain up and keep it alert. When you are tired, bored, or sitting still for a long time, your breathing becomes shallow, and less fresh air reaches your lungs. A yawn pulls in a large amount of air in one go, and it also stretches the muscles of the jaw and the face, which sends signals to the brain that help you feel more awake. Another idea is that yawning helps to cool the brain down slightly, because the deep breath brings in cooler air, and the stretching increases blood flow around the head. There is evidence for both ideas, and they may both be partly true. What is clear is that yawning is linked to tiredness, boredom, and transitions: waking up, going to bed, finishing a long task, or sitting in a warm room for too long. It is the body’s way of shifting gear, and it does that job by moving a lot of muscles at once, including the muscles around your eyes.
Yawning is also contagious, which is one of the strangest things about it. Seeing someone else yawn, hearing a yawn, or even reading about yawning can make you yawn yourself. This is not because yawning spreads like a cold. It is because the brain has a system that mirrors what it sees other people doing, and yawning is one of the behaviours that system picks up most easily. That is why a yawn can travel around a room in seconds, and why you may have yawned just now while reading about yawning. The contagious part is a separate mystery from the watery eyes, but it is worth knowing, because it explains why the two things often seem to arrive together in groups of people.
The Muscles Around Your Eyes and the Tear Glands
To understand why your eyes water when you yawn, you need to know a little about what sits around your eyes. Your eyes sit in bony sockets, and they are surrounded by muscles that move them, open and close the eyelids, and shape the face when you smile, frown or squint. One of the most important of these is a circular muscle called the orbicularis oculi, which runs in a ring around each eye, just under the skin of the eyelids. When you blink, this muscle closes the eyelids gently. When you squeeze your eyes shut hard, it contracts strongly, pulling the eyelids tight and wrinkling the skin at the corners of your eyes. It is this muscle that does most of the squeezing during a yawn.
Just above the outer corner of each eye, tucked under the bone of the brow, sits the lacrimal gland, which is the main tear gland. It is about the size of a small almond, and its job is to make tears. The tears it makes flow across the surface of the eye, keep it moist and clean, and then drain away through two tiny holes at the inner corners of the eyelids, down into the nose. There are also many smaller tear glands along the edges of the eyelids that make a steady, small supply of tears all day. The lacrimal gland is the one that makes the big flood of tears when your eyes need washing out, for example when something gets in your eye, or when you cry, or when you yawn.
The important point is where the lacrimal gland sits. It is right next to the muscles that squeeze your eyes shut, and it is held in place by soft tissue that moves when those muscles contract. When you yawn, your jaw opens wide, your face stretches, and the muscles around your eyes tighten and squeeze. That squeeze presses on the tissue around the lacrimal gland, and the gland releases extra tears, a bit like squeezing a wet sponge makes water come out. The tears have nowhere to go except across the surface of the eye and over the edge of the eyelid, which is why they appear in the corners of your eyes and sometimes run down your cheek. It is a simple, mechanical effect, and it happens to almost everyone, at least sometimes.
Why the Squeeze Makes Tears Spill Over
The squeeze alone does not explain everything, because the tears also have to get past the drainage system. Normally, tears drain away through the tiny holes at the inner corners of your eyelids, called puncta, and then down small tubes into the nose. This drainage system can handle the normal, steady flow of tears easily. But during a yawn, two things happen at once that overwhelm it. First, the squeeze on the tear gland releases a sudden rush of extra tears, far more than the steady flow. Second, the same squeeze that presses the gland also squeezes the eyelids shut and presses on the drainage tubes, narrowing them for a second or two. So more tears are being made at exactly the moment when the drains are partly squeezed shut. The result is that the tears have nowhere to go except over the edge of the eyelid, and that is what you see and feel.
The size of the yawn matters a lot. A small, polite yawn, where you barely open your mouth and you keep your eyes open, usually does not water your eyes at all, because the muscles around the eyes barely move. A big, wide yawn, where your jaw stretches open, your eyes squeeze shut, and your whole face scrunches up, almost always produces tears, because the squeeze is much stronger. This is why the watering is not the same every time. It depends on how hard you yawn, and that depends on how tired you are, how big the yawn is, and whether you try to hold it back. Trying to stifle a yawn by keeping your mouth closed and your eyes open usually reduces the watering, because you are stopping the squeeze from happening. Letting the yawn out fully usually increases it, because the squeeze is stronger.
There is also a pressure effect. A deep yawn changes the pressure inside your chest and your head for a few seconds, because you are breathing in deeply and stretching muscles that are connected to the area around your eyes and your ears. This change in pressure can push a little extra fluid towards the tear glands and the surface of the eye, adding to the effect of the squeeze. It is a small effect, but it helps to explain why a yawn can make your eyes water even when the squeeze alone would not be enough. Your eyes are not crying. They are being squeezed, and the tears are the result of that squeeze, not of any emotion. That is why the tears from a yawn feel different from the tears from sadness: they come quickly, they clear quickly, and they do not come with the tight throat or the heavy feeling that real crying brings.
Why It Happens More When You Are Tired
Yawning happens most when you are tired, and tired eyes water more easily than rested eyes. That is not a coincidence. When you are tired, several things about your eyes change at once, and each one makes watering more likely. First, you blink less often when you are tired. Blinking is what spreads the tear film across the surface of the eye and keeps it moist. When you blink less, the tear film gets thinner, and the surface of the eye gets drier. Second, when you are tired, the muscles around your eyes are already working harder to keep your eyelids open, and they are more likely to squeeze hard when a yawn comes, because the whole face is tensing up to fight the tiredness. Third, tiredness often comes with dry air, because you have been sitting indoors for a long time, or you have been looking at a screen, and both of those dry the eyes out further.
Sleep itself matters too. During sleep, your eyes are closed, and the tear glands rest. When you wake up, the tear film needs a little time to settle back into its normal pattern, and the first yawns of the morning often produce more tears than yawns later in the day. This is one reason the watering is often worst in the morning, when you are still half asleep and yawning repeatedly. The eyes are waking up, the tear glands are starting to work again, and each yawn squeezes them before they have fully settled. The same thing can happen late at night, when you are fighting sleep and yawning again and again. Each yawn adds a little more fluid to the front of the eye, and because you are tired, you are blinking less, so the tears are not being spread and drained as efficiently as usual. They pool in the corners of the eyes and spill over.
There is also a simpler reason: when you are tired, you yawn more, and when you yawn more, you get more chances for your eyes to water. A person who yawns once in an hour may never notice any tears. A person who yawns ten times in an hour, because they are exhausted, will notice it every time. The link between tiredness and watery eyes is not that tiredness itself makes tears. It is that tiredness brings yawning, and yawning brings the squeeze, and the squeeze brings the tears. If you are well rested and you yawn once, your eyes may water a little. If you are very tired and you yawn again and again, your eyes will water a lot, and that is normal. It is a sign that your body is tired, not a sign that your eyes are in trouble.
Why Some Yawns Water Your Eyes and Others Do Not
Not every yawn makes your eyes water, and most people have noticed this. Sometimes you yawn and nothing happens. Sometimes you yawn and tears run down your face. The difference usually comes down to how wide the yawn is, how hard the muscles squeeze, and how your eyes were doing before the yawn started. A small yawn, where your mouth opens only a little and your eyes stay open, barely moves the muscles around the eyes, so the tear glands are hardly pressed at all, and no extra tears are released. A big yawn, where your jaw drops wide, your eyes squeeze shut, and the muscles of your whole face tighten, presses the tear glands firmly, and the tears come. The size of the yawn is the single biggest factor.
The state of your eyes before the yawn matters too. If your eyes are already moist and comfortable, the extra tears from a yawn may be drained away without you noticing. If your eyes are dry, because you have been staring at a screen, or sitting in dry air, or you are tired, then the surface of the eye is already irritated, and the yawn triggers a bigger rush of reflex tears, because the eye is already asking for moisture. This is why the same yawn can water your eyes on one day and not on another. On the day your eyes are rested and moist, the yawn passes quietly. On the day your eyes are dry and tired, the same yawn sets them off. It is not the yawn that has changed. It is the condition of your eyes.
Age and face shape play a part as well. Older people tend to have drier eyes, because the tear glands make less of the steady tears with age, so they are more likely to notice watering when they yawn. People whose tear drainage channels are narrower may also notice it more, because their eyes drain tears more slowly, so even a small extra rush of tears spills over instead of draining away. None of this is a problem on its own. It is simply the way different bodies work. If your eyes water every time you yawn, and your friend’s eyes never do, it does not mean your eyes are weaker. It means your tear glands are squeezed a little more easily, or your drainage is a little slower, or your eyes are a little drier. These are small, normal differences, and they are nothing to worry about.
Yawning, Blinking and the Film on Your Eyes
Blinking and yawning are closely connected, and understanding that connection makes the watering easier to explain. Every time you blink, your eyelids sweep across the surface of the eye, spreading a fresh layer of tears and wiping away dust and old tears. A normal person blinks about fifteen to twenty times a minute when they are awake and relaxed, though the rate drops a lot when they are concentrating, reading, or looking at a screen. During a yawn, the normal rhythm of blinking is interrupted. Your eyes squeeze shut for a second or two, then open again, and the tear film is disturbed. The squeeze pushes extra tears onto the surface, and then the first blink after the yawn spreads those tears across the eye, which is why the watering often seems to happen just after the yawn finishes, rather than during it.
There is another detail worth knowing. The tear film has an oily outer layer that stops the watery tears from evaporating too quickly, and that oil is made by tiny glands along the edges of the eyelids. Each blink squeezes a little oil out of those glands and spreads it across the eye. During a yawn, the strong squeeze of the eyelids pushes out more oil than usual, and it also pushes out more tears. For a few seconds after the yawn, the surface of the eye has more tears and more oil than normal, and the eye needs a few blinks to settle back to its usual balance. That is why the watering from a yawn clears up quickly on its own. The eye is not damaged. It is just dealing with a sudden extra amount of fluid, and a few normal blinks are enough to spread it, drain it, and restore the usual balance.
This is also why rubbing your eyes after a yawn is a bad idea. Rubbing pushes more tears out of the glands, irritates the front of the eye, and can push dust and germs from your hands onto the eye. Blinking a few times and wiping the tears gently with a clean tissue is all you need. The watering will stop within a minute, because the tear glands will slow down once the squeeze is over, and the drainage system will catch up. If you yawn again a moment later, it will happen again, and that is normal too. Each yawn is a fresh squeeze, and each squeeze brings a fresh rush of tears.
What People Usually Notice About It
Most people first notice that their eyes water when they yawn as children, and they usually ask about it once and then forget about it, because it is so ordinary. But there are a few patterns that people notice over the years, and they are worth naming, because they show that the experience is shared and normal. The first is that it happens more in the morning and late at night, when yawning is most frequent. The second is that it happens more when you are trying not to yawn, for example in a meeting or a classroom, because holding a yawn back makes the muscles tense up more, and when the yawn finally escapes, the squeeze is stronger. The third is that it can happen when someone else yawns, because yawning is contagious, and a yawn that you catch from someone else squeezes your eyes just as much as a yawn of your own.
Some people also notice that their eyes water more when they yawn after being outside in the cold or the wind. That makes sense, because the wind and the cold have already irritated the surface of the eye and triggered some reflex tearing, so the eye is already wet and sensitive before the yawn even starts. The yawn then adds more tears on top of the ones that are already there, and the drainage system is already working hard, so the extra tears spill over more easily. In the same way, people who have been crying, or who have something in their eye, or who have been chopping onions, will find that a yawn makes the watering worse, because the eye is already flooded and the yawn adds to it.
A few people worry that watering when they yawn means their tear ducts are blocked, or that they have an eye problem. In most cases, that worry is not justified. Watering that happens only when you yawn, and clears up within a minute, is a normal reflex, and it happens to almost everyone at least sometimes. It becomes worth mentioning to a health professional only if the watering happens all the time, even when you are not yawning, or if it comes with pain, redness, swelling, discharge, or a change in your vision. Those are signs of something else, and they deserve a proper look. But watering that comes and goes with a yawn, and stops on its own, is simply the body working as it should. It is a small, everyday reminder that your eyes and your face are connected in ways you rarely think about, until a yawn shows you.
My Take:
If you ask me what I think about eyes watering when you yawn, my answer is that it is one of the most harmless and most interesting things the body does. It looks strange, because tears are supposed to mean sadness, and a yawn is not sad at all. But once you know that a yawn squeezes the muscles around your eyes and presses on the tear glands, the whole thing makes sense, and it stops being strange. It is not emotion. It is mechanics. Your face stretches, the muscles tighten, the gland is squeezed, and tears come out. That is all that is happening, and it happens to almost everyone, which is why I think it is worth explaining plainly instead of leaving people to wonder about it.
I think the reason this small question deserves a proper answer is that it shows how the body works as a connected system, not as separate parts. Your eyes do not work on their own. They are connected to the muscles of your face, to the glands that make tears, to the tubes that drain those tears into your nose, and to the brain that decides when you are tired and when you need to yawn. A yawn pulls all of those parts together for a few seconds, and the watering is the visible result. I find that genuinely interesting, because it is a reminder that the body is not a collection of separate machines. It is one system, and a movement in one part can show up in another part that seems unrelated. Your jaw opens, and your eyes water. That is the body working as a whole, and I think it is worth noticing.
I also think there is a useful lesson in this about tiredness. Yawning happens most when you are tired, and tired eyes water most easily, because you blink less, your eyes are drier, and your muscles are tenser. So when your eyes water every time you yawn, it is often your body telling you, in its own quiet way, that you need rest. I do not mean that every watery yawn is a warning sign. I mean that the pattern is worth paying attention to. If you are yawning again and again, and your eyes are watering with every yawn, and it is the middle of the afternoon, your body is probably asking for a break, or for sleep, or at least for a few minutes away from whatever you have been staring at. That is not a medical diagnosis. It is common sense, and it is the kind of common sense that is easy to ignore when you are busy. A yawn is a small thing, but it is also a message, and I think it is worth listening to.
There is another point I want to make, and it is about not overthinking small things. I have seen people worry about watering eyes when they yawn, and search for a hidden problem, when the answer is simply that a yawn squeezes the tear glands. Not every thing the body does is a sign of illness. Some things are just the body doing its job, and the job of the tear glands is to make tears when they are squeezed, pressed or irritated. A yawn does all three. I think we do ourselves a favour when we learn which bodily quirks are normal and which ones deserve attention, because that knowledge stops us from worrying about the normal ones and helps us act quickly on the ones that matter. Watering when you yawn, on its own, is a normal one. Watering all the time, with pain or redness or a change in vision, is one that deserves attention. Knowing the difference is more useful than worrying about both in the same way.
If a friend asked me about this, I would keep it short. I would tell them that a yawn squeezes the muscles around the eyes, those muscles press on the tear glands, and the extra tears spill over because the drains cannot keep up for a second or two. I would tell them that big yawns water the eyes more than small ones, and that tired eyes water more than rested ones. I would tell them to blink a few times and wipe the tears away gently, and not to rub their eyes. And I would tell them that if the watering only happens when they yawn and clears up quickly, there is nothing to worry about, but if it happens all the time or comes with pain, they should talk to a health professional. That is the whole answer, and it fits in a short conversation. It does not need a long explanation or a complicated plan.
I also want to say something about the contagious side of yawning, because I think it is delightful. The fact that seeing someone else yawn can make you yawn, and that your eyes will then water too, is a reminder that we are social creatures, and that our bodies respond to other people without us deciding to. It is a small, harmless example of how connected we are to the people around us. A yawn can travel around a room in seconds, and with it, a wave of watery eyes. There is nothing to be embarrassed about in that. It is simply the way the brain mirrors what it sees, and the way the face follows the brain. If you yawn in a meeting and your eyes water, and then the person next to you yawns too, you are not doing anything wrong. You are both doing something deeply human, and a little bit funny, and I think it is better to smile at it than to worry about it.
Finally, I want to be honest about the limits of what I have said here, as I always try to be. This article is general information, not personal advice. I am not a doctor, and this is not a diagnosis. If your eyes water all the time, or if the watering comes with pain, redness, swelling, discharge, or any change in how well you can see, then please talk to a health professional, because those are the signs that deserve a proper look. But if your eyes water when you yawn, and the tears clear up within a minute, and nothing else is wrong, then in my view you have nothing to worry about. You have a body that works the way bodies are supposed to work, and a yawn that squeezes a little harder than you expected. Wipe your eyes, take a breath, and carry on. And if you are yawning a lot, maybe get some rest. Your body is probably asking for it.
One last thought. I believe that the small questions about the body are worth answering well, because they are the questions everyone has, and they are the ones that are most often left unanswered. Why do our eyes water when we yawn? It is a question a child might ask, and it deserves a clear, honest answer, not a shrug. The answer is simple: a yawn squeezes the muscles around your eyes, those muscles press on the tear glands, and the tears spill out. But behind that simple answer is a story about how the face works, how tears are made and drained, why tiredness matters, and why the body is one connected system rather than a set of separate parts. I think that story is worth telling, and I hope this article has told it clearly. The next time you yawn and your eyes water, you will know exactly what just happened, and that knowledge is a small but real comfort.
I also think it is worth saying something about the embarrassment that yawning can cause, because it is real, even though the yawning itself is harmless. A yawn in a meeting, in a classroom, or during a conversation can feel rude, and watery eyes can make it look as though you have been crying, which is worse. People cover their mouths, look away, and hope nobody noticed. I understand that feeling, but I think it helps to remember that everyone in the room has yawned too, and everyone has had watery eyes after a yawn. It is one of the most universal human experiences there is. A yawn is not a sign of disrespect. It is a reflex, and it happens to the most polite and attentive person in the room just as much as to anyone else. If your eyes water after a yawn, wipe them, take a breath, and carry on. Nobody who matters will think less of you for it, and most people will not even notice.
There is another angle to this that I find genuinely fascinating, and it is that scientists still do not fully agree on why we yawn at all. The idea that yawning wakes the brain up has good evidence behind it. The idea that yawning cools the brain also has evidence, because the brain works best at a steady temperature, and a deep breath of cooler air, together with the stretching of the jaw and the increased blood flow, can lower the temperature of the brain very slightly. Some researchers have found that people yawn more when the air around them is warm, which fits the cooling idea. Others point out that yawning is linked to changes in alertness, and that it happens most at times when the brain is shifting between states, such as waking up or falling asleep. The truth is probably that yawning does more than one thing at once, and that different explanations are true in different situations. I like that uncertainty, because it is honest. It reminds us that the body still holds mysteries, even in something as ordinary as a yawn, and that a simple question can have an answer that science is still working out.
I also want to say something about children, because they yawn and their eyes water just as much as adults, and they often ask about it in a direct, honest way that adults have forgotten. A child who asks why their eyes water when they yawn deserves a real answer, not a shrug. The answer is simple enough for a child to understand: when you yawn, the muscles around your eyes squeeze tight, and that squeeze presses on the little glands that make tears, so the tears come out. That is the whole explanation, and it is true. I think it matters to answer children’s questions about their bodies clearly, because those small answers build up into a general trust in how the body works. A child who learns that tears can come from a squeeze, and not only from sadness, has learned something true about the body, and that knowledge will stay with them.
And so, to bring this to a close, my view is simple. Eyes watering when you yawn is normal, it is mechanical, it is common, and it is nothing to worry about on its own. It is the squeeze of the face pressing on the tear glands, and the drains not keeping up for a second or two. It happens more when you are tired, more with big yawns than small ones, and more when your eyes are already dry. The answer is to blink, wipe gently, get some rest, and carry on. And if the watering does not follow the yawns, or if it comes with pain or a change in vision, then talk to a health professional. That is the whole of it.
That is all I have to say on this, and I am glad the answer is a reassuring one. Most of the small mysteries of the body turn out to have simple, mechanical explanations, and this is one of them. A yawn squeezes, the glands release tears, and the eyes water for a few seconds. There is no hidden problem behind it, and no reason to worry. Remember that the next time you yawn and reach for a tissue.
Frequently Asked Questions
Can our eyes water when we yawn be linked to sleep or tiredness?
Yes. Yawning happens most when you are tired, and tired eyes water more easily because you blink less, your eyes are drier, and the muscles around your eyes are tenser. When you are very tired you also yawn more often, so you get more chances for your eyes to water. The watering itself is caused by the squeeze of the yawn, but tiredness makes it more likely and more noticeable.
Is our eyes water when we yawn something I should worry about?
For most people, no. Watering that happens only when you yawn and clears up within a minute is a normal reflex. The yawn squeezes the muscles around your eyes, presses on the tear glands, and extra tears spill out. It becomes something to pay attention to only if the watering happens all the time, even when you are not yawning, or if it comes with pain, redness, swelling or a change in your vision.
How long does our eyes water when we yawn usually last?
Usually less than a minute. The extra tears are released by the squeeze of the yawn, and once the yawn is over, the tear glands slow down and the drainage system catches up. A few normal blinks spread the tears across the eye and drain them away. If the watering lasts much longer than a minute, or if it happens without yawning, that is a different pattern and worth mentioning to a health professional.
When should I speak with a healthcare professional about our eyes water when we yawn?
Speak with a health professional if your eyes water all the time, indoors and outdoors, even when you are not yawning, or if the watering comes with pain, redness, swelling, discharge, or any change in your vision. These can be signs of a blocked tear duct, an infection or another eye problem that deserves a proper look, rather than something a yawn explains.
Does our eyes water when we yawn happen to many people?
Yes, it happens to almost everyone at least sometimes. A big, wide yawn squeezes the muscles around the eyes and presses on the tear glands, so extra tears spill out. Some people notice it more than others, depending on how wide they yawn, how dry their eyes are, and how quickly their tear drains work, but it is a normal, common reflex, not a rare problem.
Can small daily habits really help with our eyes water when we yawn?
Small habits can reduce it, though they will not stop it completely, because the squeeze of a yawn will always release some tears. Getting enough sleep, blinking fully and often, taking breaks from screens, and drinking enough water all help keep the tear film healthy, so the eyes are less dry and less easily irritated. The watering from a yawn is normal, but rested, moist eyes cope with it better and the tears clear faster.
