Why Do We Cry When We’re Extremely Happy?

We cry when we’re happy because tears of joy appear to be a “dimorphous expression” that helps restore emotional equilibrium. Research by Yale psychologist Oriana Aragón suggests that pairing a negative response (crying) with an overwhelming positive feeling helps tone the emotion down, letting us regain composure and recover from the intense high more quickly.

Each of us must’ve been to at least one wedding and seen a few close relatives shed happy tears as the couple exchange their vows. Similar expressions of emotions occur during graduation ceremonies, upon the birth of a child, and on other happy occasions. Humans are strange creatures with plenty of incongruous behaviors. Crying is a behavior that most people interpret as an indicator of being sad. It makes you wonder why anyone would express a negative emotion (crying) during a positive occasion…

Researchers have investigated this question empirically, and a few competing theories have been floating around for a while too. Let’s look at what each one says.

Restoring Emotional Equilibrium

A psychologist named Oriana Aragón, who studied this topic at Yale University, explains that expressing a negative emotion in an extremely positive situation may help to restore emotional equilibrium. We can think of it as our mind performing emotional homeostasis. In a 2015 study published in Psychological Science, Aragón and her colleagues showed participants cute baby photos and recorded their reactions. Alongside the cooing and smiling, many people reported the urge to pinch, squeeze, or playfully “gobble up” the babies, a paired positive-and-negative reaction she calls a dimorphous expression. The telling result: people who showed these negative urges most strongly also experienced a bigger drop-off in their positive emotion a few minutes later. In other words, the “negative” reaction seems to help them recover from the high and moderate their emotions faster. The same logic explains nervous laughter, where the anxiety is so great that we laugh or giggle to relieve the system of the stress caused by feeling nervous or anxious.

However, why would we want to tone down happiness? Isn’t that what we always desire…to be extremely happy. But when we finally get to that “happy place”, our brain wants to tone it down! That being said, extreme emotions interfere with decision-making abilities and I’m sure that no one wants to compromise their rationality for happiness, right?

The Case Of Mistimed Expressions

Another untested hypothesis states that we cry not because of the happy situation, but because of negative emotions experienced earlier, which had been held back for an extended period. In the case of a graduation ceremony, perhaps the student unconsciously remembers all the hardships faced during the course and the ceremony adds a sense of finality and cessation to that hardship.  Similarly, an athlete who wins a trophy may not be shedding tears because winning is painful, but because the journey to that win was painful and at that earlier time, the pain could not be expressed.

Amygdala – Tear Production Connection

A neural explanation for this strange behavior is related to the threshold of our brain’s emotion-regulating circuitry. Both happy and sad emotions lead to intense emotional arousal, even though the underlying responses in the brain are quite different. The center in the brain that handles emotion (the amygdala), parts of the hypothalamus, and the basal ganglia all feed into a cluster of cells in the brain stem (often called the lacrimal nucleus) that drives the tear glands. So the threshold hypothesis runs like this: whenever we feel an extreme emotion, whether positive or negative, the amygdala registers the high arousal level, and that signal spills over into the lacrimal nucleus, triggering tear production through their close connection.

It also helps to remember that not all tears are the same. Scientists generally describe three kinds: basal tears, which constantly lubricate and protect the eye; reflex tears, which flush out irritants like onion fumes or a stray eyelash; and emotional (or psychic) tears, the ones that well up when we are overwhelmed by joy or grief. Emotional tears are thought to be unique to humans, and they are chemically distinct, carrying higher levels of stress-related hormones such as ACTH and the painkilling endorphin leucine-enkephalin. That difference is one reason researchers suspect a good cry, happy or sad, may help bring the body back toward a calmer, balanced state.

Why Do We Laugh While Crying, Or Cry When Others Are Happy?

If happy tears feel strange, the mind has plenty of cousins that feel just as crossed up. Have you ever laughed in the middle of sobbing, or felt your own eyes sting watching someone else open the gift they always wanted? These belong to the same family of dimorphous expressions we met earlier: an intense feeling leaking out through a display that seems to belong to the opposite emotion. Oriana Aragón's group treats them as one phenomenon, and as lead researcher she put it, these reactions “seem to take place when people are overwhelmed with strong positive emotions, and people who do this seem to recover better from those strong emotions.”

Nervous laughter is the mirror image of the happy cry. The situation is tense rather than joyful, yet the same trick applies: pairing a discordant signal (a giggle) with the runaway feeling (anxiety) seems to take the edge off and pull us back toward the middle. So the awkward chuckle at a funeral or before a hard conversation is not callousness. It is the nervous system trying to steady itself, the same way the wedding guest's tears do.

Then there is crying at other people's happiness, which has more to do with empathy than with our own news. Tears are a powerful social signal. People are more likely to offer help and warmth to someone who is crying, whether the tears are sad or joyful, and emotional displays spread easily from one person to the next, much like a yawn or a fit of laughter. When we see a friend overwhelmed at a graduation or a proposal, the brain reads it as a moment that genuinely matters, and our own tears well up to mark it. Far from being a malfunction, happy crying tells everyone watching that something meaningful just happened.

When Are Happy Tears A Reason To See A Doctor?

For almost everyone, crying at a wedding or welling up at good news is perfectly healthy, even useful. But there is a rarer pattern worth knowing about, because readers often ask whether uncontrollable happy crying is normal. It usually is. Occasionally, though, sudden outbursts of laughing or crying that do not match how a person actually feels point to a neurological condition called pseudobulbar affect (PBA), sometimes described as emotional incontinence.

The hallmark of PBA is a mismatch: the episodes are more explosive in onset and shorter than ordinary crying, and they are not tied to any lasting sadness underneath. They are thought to come from disrupted signaling along a cerebro-ponto-cerebellar pathway, with the cerebellum failing to keep emotional displays in proportion to the situation. That is why PBA almost always shows up alongside an existing neurological problem, including stroke, multiple sclerosis, Parkinson's disease, Alzheimer's disease, traumatic brain injury, or ALS. The Cleveland Clinic estimates that roughly 2 to 7 million people in the United States are affected.

The takeaway is reassuring. If your happy tears arrive at genuinely happy moments and reflect what you feel inside, there is nothing to fix and a lot to enjoy. It is only when laughing or crying spells feel uncontrollable, mismatched to your mood, and out of keeping with what is happening around you, especially if you already have a neurological condition, that it is worth raising with a doctor.

Despite all those earlier hypotheses, it is still too early to tell exactly why we have such incongruent behavior in times of happiness without further research. So far, based on behavioral data, the best explanation seems like the emotional equilibrium one, but understanding the neuro-anatomical correlations may help to clarify whether that or the amygdala-lacrimal nucleus connection is a more viable explanation.

Whatever the explanation may be, no one really minds expressing immense joy through tears. It’s actually a wonderful feeling!