There is a popular image doing the rounds online that calls a tear the most expensive liquid in the world, declaring it 1% water and 99% feelings. As a piece of chemistry, it is nonsense. As a piece of human truth, it is almost unbearably accurate. The science of why we cry is stranger and gentler than any meme, and once you understand it, the closing line of that image, think before you hurt someone, stops being sentimental and starts sounding like sound advice. This is an article about tears, the nervous system, and the small daily cruelties we hand out without noticing.
The beautiful lie in the image
Let me deal with the chemistry first, because it matters. A tear is not 1% water. It is overwhelmingly water, somewhere around 98% of it, carried alongside salts, lipids, antibodies, and a scattering of proteins. The poetic ratio has been reversed for effect, and I understand why. “98% water and a few interesting proteins” does not move anyone to share a post.
But the truth is more interesting than the myth, which is usually the way of things. The remaining sliver of a tear, the part that is not water, is where the story lives.
Three kinds of tears, and only one that breaks your heart
We do not produce one kind of tear. We produce three. Basal tears keep the eye lubricated all day without our noticing. Reflex tears flush out the sting of onions, smoke, or grit. And then there are emotional tears, the ones that arrive uninvited at a funeral, a wedding, or a sentence you did not expect to land.
These are not interchangeable. The chemist William H. Frey II, who studied tears for years at a Minnesota medical centre, found that emotional tears contain more prolactin, adrenocorticotropic hormone, and leucine enkephalin, an endorphin that reduces pain. His research reported that the protein concentration of emotional tears in women exceeded that of irritant tears by roughly a quarter. In other words, the tears you cry over a person are chemically distinct from the tears you cry over an onion. The body knows the difference even when we pretend not to.
Frey proposed that crying might help the body shed stress-related chemicals, a kind of emotional housekeeping. It is a lovely idea, and it caught on quickly. Honesty requires me to add that this catharsis theory is debated. Some researchers point out that tears carry only a limited capacity to flush chemicals from the body, so the relief we feel after weeping may owe more to social comfort and nervous-system regulation than to detoxification. The feeling is real. The mechanism is still being argued over. That distinction is worth holding onto, because adults are allowed to find something both true and unproven at once.
What your nervous system is doing when you weep
Here is the part that fascinates me as a coach. Crying is not weakness leaking out of you. It is regulation working. A hard cry often shifts the body from sympathetic arousal, the fight-or-flight state, toward parasympathetic recovery, the rest-and-repair state. This is why people describe feeling oddly clean and quiet after sobbing, as though a fever had broken. The shaky breath, the heaviness, the eventual calm, these are the signatures of a nervous system finding its way back to baseline.
So when someone tells you to stop crying and pull yourself together, they are, neurologically speaking, asking you to interrupt your own recovery. We have built whole cultures, and many boardrooms, on exactly that instruction.
Why we learn to hide the most honest thing we do
Most of us were taught, early and thoroughly, that tears are an inconvenience. Boys especially absorb this. By adulthood, the suppression is so automatic that many people genuinely cannot cry, even when they want to. This is not strength. It is a learned defence, a small chronic tightening of the body against its own signals.
I once worked with a senior leader who had not cried in over a decade and wore it as a badge. Halfway through a session about his father, the badge fell off. He apologised four times in two minutes, which told me more about his upbringing than anything on his CV. That is a composite portrait rather than one specific client, but I have met a version of him in almost every cohort I coach. The pattern is always the same. The tears were never the problem. The shame attached to them was.
“Think before you hurt someone”
This is where the image, for all its faulty chemistry, earns its keep. If emotional tears genuinely carry the body’s stress hormones to the surface, then making someone cry is not a neutral event. You have triggered a measurable physiological response in another human being. You have raised their stress load and forced their nervous system into recovery mode. That is a real cost, paid by their body, often invisibly, long after the conversation ends.
We are casual with this. We use sharp words in marriages, in parenting, in management, telling ourselves it was only words. But the person on the receiving end is metabolising those words in cortisol and lost sleep. A leader who reduces a colleague to tears in a meeting has not won anything. They have simply outsourced their own dysregulation onto someone with less power to object.
Moving forward
So here is the practical reflection I would leave you with. The next time tears rise in you, resist the old reflex to swallow them. Let your body finish the sentence it started. And the next time you feel the urge to wound someone with your words, pause long enough to remember that you are about to alter another person’s biochemistry, not just their mood.
Tears are not the most expensive liquid in the world. But the relationships we damage while pretending they cost nothing very often are.
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