In 1872, Charles Darwin was puzzled by weeping. In The Expression of the Emotions in Man and Animals, he devoted considerable attention to the mechanics of tears and the contraction of the orbicularis oculi muscle around the eye during crying. He documented that infants cry loudly in distress, that this crying appears universal across human cultures, and that the expressive face of sorrow is remarkably consistent across peoples who have had no contact with each other.

What puzzled Darwin was the tears themselves. Emotional tears — the secretion of tears during emotional distress without any mechanical irritant to the eye — serve no obvious biological function. They don't see better. They don't protect against infection any more than basal tears do. In all of the rest of the animal kingdom, no other species cries for emotional reasons. Crocodiles, whose eyes water when they eat (likely due to the effort of swallowing), gave us the metaphor of "crocodile tears" — deceptive display without genuine emotion. But only humans, when sad, when overwhelmed, when moved by music or loss or beauty, produce actual emotional tears.

Darwin described emotional weeping as "purposeless." It has taken another hundred and fifty years of research to begin to understand why he was wrong.

"The tears stream down my face and I didn't even know why. Something in the music catches me before I do." — an anonymous participant in research on musical chills

Key Definitions

Emotional tears — Tears produced in response to emotional states rather than mechanical irritation or reflex. Chemically distinct from basal (lubricating) and reflex (irritant-response) tears: emotional tears contain higher concentrations of prolactin, adrenocorticotropic hormone (ACTH), and leucine enkephalin (an endorphin). The only type of lacrimation unique to humans.

Lacrimal system — The tear-production apparatus: lacrimal glands (main secretory organ, above and to the side of each eye), accessory lacrimal glands, and the nasolacrimal duct (drainage). The main lacrimal gland is under both sympathetic and parasympathetic control; emotional crying appears primarily mediated by parasympathetic (cholinergic) activation via the pterygopalatine ganglion.

Prolactin — A pituitary hormone primarily known for its role in lactation but also involved in immune function and stress response. Elevated by emotional stress and physical pain; associated with crying frequency (women's higher prolactin levels may partly explain higher crying rates). Prolactin is found at high concentrations in emotional tears.

Limbic system — A set of brain structures (amygdala, hippocampus, anterior cingulate cortex, hypothalamus, and related areas) involved in emotion processing, memory, and autonomic regulation. The source of the emotional activation that triggers the brainstem circuits producing tears.

Anterior cingulate cortex (ACC) — A region at the junction of the frontal lobes and cingulate gyrus, involved in emotional pain processing, conflict detection, and social awareness. The "hurt" of rejection and social loss activates the ACC through circuitry shared with physical pain. ACC lesions can produce pathological laughing and crying (pseudobulbar affect) — uncontrollable emotional expression disconnected from felt emotion — illustrating the ACC's role in modulating emotional expression.

Emotional suppression — The behavioral inhibition of emotional expression — not showing felt emotion. Distinct from not feeling emotion. Associated with physiological costs (autonomic arousal of the suppressed emotion remains elevated) and relationship costs (reduced intimacy, less perceived authenticity). Distinguishable from cognitive reappraisal (which modulates the emotion before it is fully generated, with better outcomes).

Catharsis — The purging or release of emotion. Aristotle's concept of emotional release through experiencing drama. In the context of crying, the popular belief that crying relieves emotional tension through a hydraulic-release mechanism. Partially supported by evidence (many people feel better after crying) but the mechanism is more complex than hydraulic release — social context and support received are primary determinants of post-crying wellbeing.

Frisson — The pleasurable chill or shiver produced by music, art, or other aesthetic stimuli. Involves piloerection ("goosebumps"), increased heart rate, and skin conductance response. Related to but distinct from aesthetic crying; both involve emotional arousal in response to art.

The Biology of Tears: Three Kinds

Not all tears are the same. The eye produces three functionally distinct types:

Basal tears — Continuously secreted lubricating fluid maintaining corneal health. Contain water, lipids, proteins (including lysozyme, an antibacterial enzyme), and mucins. The constant background production that keeps the eye moist.

Reflex tears — Produced in response to irritants (onions, smoke, cold wind, foreign objects). Larger volume than basal tears, more watery, secreted rapidly to flush away the irritant. Controlled by a reflex arc from corneal sensory receptors via the trigeminal nerve to the facial nerve's lacrimal branches.

Emotional tears — The distinctively human phenomenon. Produced by activation of the main lacrimal gland through limbic-hypothalamic-brainstem pathways. Chemically distinct from the other types: William Frey's research in the 1970s-80s documented that emotional tears contain higher concentrations of:

  • Prolactin (2.9x higher than blood serum levels)
  • ACTH (a stress hormone precursor)
  • Leucine enkephalin (an endorphin with opioid activity)
  • Potassium (24% higher than reflex tears)
  • Manganese (30x higher than blood serum)

The chemical composition of emotional tears led Frey to propose the stress-relief hypothesis: crying removes stress-related chemicals from the body, providing physiological relief. The endorphin and potassium content suggests potential mood-modulating properties. Whether swallowing these chemicals when tears drain through the nasolacrimal duct produces any pharmacological effect is unknown.

The Evolutionary Puzzle

Darwin's puzzlement is still instructive. Emotional weeping is unique to humans — and uniquely universal in humans. It appears in every studied culture, in recognizable form across languages and social contexts that have had no historical contact. Its expression is coupled with a distinct facial configuration (grief face: oblique brows, furrowed brow, downturned mouth corners) that is also cross-culturally consistent.

These features — universality, distinctive expression, and cross-cultural recognition — are the marks of evolved social signals. The question is what function emotional tears serve.

The Social Signaling Hypothesis

Ad Vingerhoets at Tilburg University has compiled the most comprehensive research program on human crying. His data consistently support an evolved social signaling function.

Tears make the crying face more visible and recognizable. Paul Zak's research found that faces with tears were rated as sadder than the same faces without tears, and that the presence of tears increased observer prosocial responses — offers of help, expressions of empathy. The teary face may function as an amplifier of distress signals, increasing their legibility and their effect on observers.

Crucially, tears are difficult to fake voluntarily. You can force a sad expression; you cannot reliably force tears. (Method actors know this — the ability to cry on demand is a rare and valued skill.) This makes tears an "honest signal" in evolutionary signal-theory terms: a signal whose production is constrained by cost or mechanism in a way that prevents it being dishonestly deployed. Honest signals are more reliable indicators of genuine internal states than signals that can be easily faked.

The context-dependence of crying relief supports the social function: people who cry in the presence of a supportive other feel significantly better than people who cry alone. The tears serve their function when they are received by a responsive social partner. Without the social response, the signal has failed.

Darwin's Problem Reconsidered

If emotional tears evolved as social signals, Darwin's puzzlement was about the wrong level of explanation. He was asking about the mechanical function of the tears — why would tears themselves have adaptive value? The answer is that their value is communicative. The tears are the visible, honest component of a distress display that evolved to recruit social support.

This connects crying to the broader evolution of human hyper-sociality. Humans are among the most socially interdependent species on earth; our survival has always required the cooperation, help, and protection of group members. In this context, reliable signals of genuine distress that elicit prosocial responses from others would be strongly selected for. Emotional crying may be part of the suite of social bonding mechanisms — alongside oxytocin release through touch, synchrony, and shared emotional experience — that holds human social groups together.

Why Crying Feels Good (Sometimes)

The popular intuition that "a good cry" provides relief is approximately 70% right — that is, approximately 70% of people report feeling better after a crying episode in surveys. But 30% feel worse or unchanged, and the factors that predict which outcome occurs are illuminating.

The Social Context Effect

Jonathan Rottenberg's research found that the single strongest predictor of post-crying mood improvement is whether the crying occurred in the presence of a supportive other. People who received comforting while crying felt substantially better; people who cried alone felt less relief; people who cried in unsupportive, judgmental contexts felt worse.

This pattern is exactly what the social signaling hypothesis predicts. If crying evolved to recruit social support, then crying that successfully recruits support achieves its function and produces the associated positive outcome. Crying that does not recruit support — because no one is present, or because the response is rejection rather than comfort — has failed to achieve its evolved function, and the distress that prompted it remains unresolved.

The Physiological Regulation Effect

Crying is associated with a distinctive physiological pattern: increased heart rate and skin conductance during the crying episode (sympathetic activation from emotional distress), followed by a parasympathetic rebound that can produce genuine calming. The post-cry state often involves reduced heart rate, reduced muscle tension, and the somewhat dazed, slowed quality that follows intense emotional release.

Rottenberg and colleagues, measuring heart rate during and after crying, found that the post-cry parasympathetic rebound was present but highly variable — not every crying episode produced equivalent physiological calming. The magnitude of the calming effect was related to the intensity of the emotional arousal during crying: intense episodes produced more pronounced parasympathetic rebounds.

The endorphin component of emotional tears may also contribute. Leucine enkephalin — an endogenous opioid found in higher concentrations in emotional tears than reflex tears — suggests that the lacrimal system may release opioid peptides during emotional crying. Whether this produces measurable mood effects is not established, but the possibility is biologically plausible.

The Resolution Frame Effect

People are more likely to feel better after crying if the crying episode feels complete or resolved — if the emotion was fully experienced and expressed, rather than cut off or suppressed partway through. Vingerhoets' research finds that episodes characterized by cathartic quality (a sense of release and completion) are more reliably associated with mood improvement than episodes that were interrupted, or where the underlying situation was genuinely unresolvable.

This suggests that the relief of crying is partly about the emotion's processing trajectory — not just the physical act of tear production, but the psychological experience of having fully engaged with and expressed the emotional content.

Music, Movies, and Aesthetic Tears

Around 25% of people report crying in response to music. More report tears from films, books, and other art forms. This "aesthetic crying" raises a distinct puzzle: why do we cry in response to fictional or artistic content that poses no actual threat?

Musical Chills and Tears

David Huron's theory of musical expectation proposes that music works by creating and resolving expectations — harmonic, rhythmic, and melodic. When expectations are violated in ways that signal resolution (the tonic arrived, the tension released), or in emotionally charged ways (a climactic build followed by sudden quiet, or an unexpected modulation), the prediction systems produce emotional responses.

The sad, longing quality of many pieces that produce tears appears to involve:

  • Appoggiaturas (notes that resolve downward, associated with grief vocalizations)
  • Slow tempos (associated with reduced arousal and sadness)
  • Minor keys and modal harmony (culturally and possibly innately associated with sadness in Western music)
  • Melodic contour descending (associated with the pitch lowering of sad speech)

The phenomenon may involve genuine simulation of grief through music's engagement of the emotion systems — not merely the cognitive recognition that the music is sad, but actual activation of the limbic responses to sadness.

The Empathic Simulation of Fiction

For film and fiction, the mechanism involves the mentalizing network — the collection of brain regions (TPJ, medial PFC, posterior STS) that normally compute others' mental and emotional states. Watching fictional characters experience distress activates the same circuitry as watching real people experience distress. The brain does not have a separate "fiction mode" that disengages emotional response.

This produces a kind of safe emotional experience: the distress response is genuine at the neural level, but occurs without real-world consequences, and is often accompanied by awareness ("I know this is a film") that provides a modulating distance. Marcia Johnson's research on "emotion memory" finds that emotional responses to fiction can be as vivid and memorable as responses to real events — the brain encodes emotionally compelling narrative regardless of whether it is labeled real or fictional.

The "sad music paradox" — why people actively seek sad music when sad, or music that makes them cry — involves several components: prolactin release during sad states (which produces a sedative, comfortable effect); the aesthetic pleasure of skillful emotional expression; the safe expression of emotions that may not be expressible in social contexts; and the sense of being understood ("this music knows exactly how I feel").

Gender, Culture, and Crying Norms

Women cry approximately 3-5 times per month on average; men approximately 1-2 times. This difference is consistent across nearly all studied cultures, though the absolute rates vary. The difference appears to have both biological and sociocultural determinants.

Biological factors: Estrogen facilitates emotional crying; testosterone inhibits it. Prolactin, which is substantially higher in women (especially during reproductive years), may lower the lacrimation threshold. Anatomical differences in the lacrimal gland — women's main lacrimal gland is slightly smaller in structure than men's, though it is unclear whether this affects secretory capacity.

Sociocultural factors: Gender norms in virtually all studied cultures permit or encourage female emotional expression more than male. Men who cry are judged more negatively in many cultural contexts — seen as less competent, less authoritative, less masculine. These norms create powerful disincentives for male crying in public contexts that partially explain behavioral differences.

Whether the biological or cultural factors are primary is contested. Cross-cultural comparisons find that the gender difference in crying frequency is smaller in countries with greater gender equality — consistent with sociocultural mediation — but the difference is not eliminated even in the most equal societies, consistent with some biological contribution.

The cultural variability is significant. Some cultures normalize adult male public crying in specific contexts (sports victories and defeats, national events, funerals); others suppress it almost entirely. The association between "not crying" and "strength" or "stoicism" is culturally specific, not universal.

When Crying Is Pathological

Most emotional crying is healthy — a normal expressive response to genuine emotional experience. Some crying patterns warrant clinical attention.

Pathological laughing and crying (pseudobulbar affect, PBA) involves uncontrollable episodes of laughing or crying that are disproportionate to or inconsistent with the person's felt emotional state. It occurs in neurological conditions affecting the brainstem and cerebellum (ALS, MS, TBI, stroke) and represents damage to the inhibitory circuits normally controlling emotional expression. It is treatable with dextromethorphan/quinidine.

Excessive crying in depression is qualitatively different from normal crying: more frequent, more intense, less tied to specific triggering events, less likely to produce relief. It reflects the emotional hyperreactivity and anhedonic quality of major depression — the ability to feel negative emotion strongly while positive emotion is blunted.

Crying inability (hypolacrimia) — inability to cry or reduced crying capacity — is associated with certain neurological conditions and with some medications (antidepressants can reduce crying frequency and intensity, which some patients experience as loss of an important emotional outlet).

Chronic suppression — the habitual pattern of inhibiting emotional expression across contexts — is associated with elevated physiological arousal, reduced relationship quality, and worse psychological health. Not the same as appropriate context-sensitivity in emotional expression; rather, the pattern of never allowing emotional experience to surface in any context.

For related concepts, see why we get angry, what causes depression, how to manage anxiety, and emotion regulation explained.

References

  • Vingerhoets, A. J. J. M. (2013). Why Only Humans Weep: Unravelling the Mysteries of Tears. Oxford University Press.
  • Rottenberg, J., Bylsma, L. M., & Vingerhoets, A. J. J. M. (2008). Is Crying Beneficial? Current Directions in Psychological Science, 17(6), 400–404. https://doi.org/10.1111/j.1467-8721.2008.00614.x
  • Frey, W. H. (1985). Crying: The Mystery of Tears. Winston Press.
  • Huron, D. (2006). Sweet Anticipation: Music and the Psychology of Expectation. MIT Press.
  • Darwin, C. (1872). The Expression of the Emotions in Man and Animals. John Murray.
  • Gross, J. J., & John, O. P. (2003). Individual Differences in Two Emotion Regulation Processes: Implications for Affect, Relationships, and Well-Being. Journal of Personality and Social Psychology, 85(2), 348–362. https://doi.org/10.1037/0022-3514.85.2.348
  • Bylsma, L. M., Croon, M. A., Vingerhoets, A. J. J. M., & Rottenberg, J. (2011). When and for Whom Does Crying Improve Mood? A Daily Diary Study of 1004 Crying Episodes. Journal of Research in Personality, 45(4), 385–392. https://doi.org/10.1016/j.jrp.2011.04.007

Tags

crying emotions psychology neuroscience social bonding grief stress

Frequently Asked Questions

Why do humans cry emotional tears — what's the evolutionary purpose?

Humans are the only species that sheds emotional tears, and the evolutionary function of this unique behavior is genuinely contested. The leading hypothesis is social signaling: emotional tears are an honest signal of emotional distress that is difficult to fake (unlike verbal claims of distress), and that evolved to elicit prosocial responses — comfort, help, and resource sharing — from others. Charles Darwin considered emotional weeping puzzling from an evolutionary standpoint (tears serve no direct mechanical function in distress). Ad Vingerhoets' extensive research on crying documents that the most consistent trigger across cultures is the experience of sadness and grief — situations where social support is most needed. The social signaling function is supported by the finding that people cry more in the presence of others than alone, that crying reliably elicits empathic responses in observers, and that people who cry in social contexts typically report more social support afterward. An alternative hypothesis — that emotional tears evolved as a byproduct of strong autonomic emotional arousal, with no specific signaling function — cannot be excluded, but the highly specific facial configuration of crying (which clearly signals emotional state) is more consistent with evolved signaling.

What happens in the brain when you cry?

Emotional crying is associated with activation of the limbic system — particularly the amygdala and anterior cingulate cortex — which generate the emotional distress, and the hypothalamus, which mediates the autonomic components. The actual tear-secretion is controlled by the superior lacrimal nucleus in the brainstem, which receives input from the limbic system and activates parasympathetic fibers (via the pterygopalatine ganglion) that stimulate lacrimal gland secretion. This explains why emotional crying is associated with parasympathetic activation despite occurring during emotionally intense moments: the social safety response may activate alongside the emotional arousal, or the parasympathetic activation of crying may be part of the body's regulatory response to intense emotion. The anterior cingulate cortex (ACC) plays a particular role — both in emotional pain (the 'hurt' of rejection, grief, and loss activates the ACC through the same circuitry as physical pain) and in crying regulation (ACC lesions can produce pathological laughing and crying). Prolactin — a hormone elevated by emotional stress — may facilitate emotional crying by lowering the threshold for lacrimation in response to limbic activation.

Does crying actually make you feel better?

The popular belief that crying is cathartic — that it releases emotional tension and reliably produces relief — is only partially supported by the evidence. Ad Vingerhoets' survey research finds that approximately 70% of people report feeling better after a crying episode, but this leaves 30% feeling worse or unchanged. The context of crying matters enormously: people who cry alone are less likely to feel relief than people who cry in the presence of a supportive other; people who cry and receive comfort feel better; people who cry in unsupportive, judgmental contexts feel worse. The 'catharsis' effect appears to depend substantially on the social response received. The physiological explanation for post-crying relief involves several mechanisms: activation of the parasympathetic nervous system (which produces calming effects), endorphin release (documented in some studies), and oxytocin release (associated with social bonding and stress relief). However, the idea that crying 'releases' stored emotional tension through a hydraulic-pressure mechanism (the Freudian hydraulic model) has no biological support.

Why do some people cry much more easily than others?

Individual differences in crying frequency are substantial and multiply determined. Women cry more frequently than men in virtually all studied cultures — on average 3-5 times per month versus 1-2 times per month — and the differences appear partly biological (estrogen lowers the crying threshold; testosterone elevates it; prolactin, which is higher in women, facilitates lacrimation) and partly sociocultural (gender norms permitting or encouraging female emotional expression more than male in most cultures). Beyond gender, individual differences in emotional reactivity (trait neuroticism), empathy (higher empathy correlates with more frequent crying), attachment style (anxious attachment is associated with more frequent crying), depression and anxiety (which lower the emotional threshold for distress), and cultural background all predict crying frequency. Adults who were insecurely attached as children cry differently in adulthood: anxious attachers tend to cry more intensely and to feel less relief; avoidant attachers tend to suppress crying and report less conscious distress — though their physiological arousal during suppressed sadness is typically as high as those who cry.

What are the different types of emotional crying?

Researchers distinguish several functional types of emotional crying. Distress crying — the response to pain, loss, or overwhelming emotion — is the most studied; it is characterized by sad facial expression, vocalizations (sobbing), and typically occurs in situations requiring comfort or help. Empathic crying — crying in response to witnessing others' emotion, beauty, or inspiring content (music, film, stories) — is distinct in that it can occur in response to positive as well as negative stimuli. Tears of joy are a related phenomenon: intense positive emotion can also produce tears, paradoxically, possibly because the intensity of the emotion activates the same limbic-hypothalamic cascade regardless of valence. Mourning or grief crying is specifically associated with loss and may have distinctive patterns over the bereavement process. Frustrated crying — particularly common in children and people with certain neurological conditions — occurs in response to blocked goals. The neurological distinction between these types is unclear, but their social functions and triggers are meaningfully different.

Why do we sometimes cry at movies, music, or art?

Crying in response to art, music, and fiction — what researchers call 'aesthetic crying' or 'tears of emotion' — is a particularly fascinating phenomenon because it involves distress responses to situations that pose no actual threat. The most studied version is musical: around 25% of people report crying in response to music, and many more report 'chills' (frisson). The triggers typically involve elements that signal change or transcendence: unexpected harmonic resolutions, key changes, climactic builds, or moments of musical virtuosity. David Huron's theory of musical expectation proposes that music manipulates the reward and prediction systems — creating and resolving expectation — which produces emotional responses including sadness-like states. For film and fiction, the mechanism appears to involve genuine empathic simulation: the mentalizing network (TPJ, medial PFC, posterior STS) that normally mediates understanding others' emotional states activates in response to fictional characters' situations, producing real emotional responses to imagined distress. The 'sad music paradox' — why people seek and enjoy sad music — involves a combination of safe emotional experience (without real-world consequences), prolactin release (which produces comfort), and the aesthetic appreciation of skillful emotional expression.

Is suppressing crying bad for you?

The evidence on emotional suppression and health is nuanced. Chronic emotional suppression — the habitual tendency to conceal emotional experience and expression across situations — is associated with worse psychological health (higher anxiety and depression), worse relationship quality, and some evidence for worse physical health outcomes (elevated blood pressure, impaired immune function). James Gross's model of emotion regulation distinguishes suppression (inhibiting the expressive response after an emotion has been generated) from cognitive reappraisal (reinterpreting the situation before the emotional response develops). Suppression is less effective than reappraisal: it requires ongoing cognitive effort, fails to reduce the subjective emotional experience, and has physiological costs. However, 'not crying in a given situation' is not equivalent to chronic emotional suppression: choosing not to cry at work, then processing the emotion privately later, is adaptive context-sensitive regulation. The problem is not individual instances of non-crying but the chronic general pattern of not allowing oneself emotional experience or expression in any context. The cultural messages that tell men not to cry, in particular, may foster chronic suppression patterns with genuine health costs beyond individual instances of not crying.

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