Your body makes tears through a surprisingly complex system involving multiple glands, nerves, and chemical signals. Whether you’re trying to cry on command, produce more tears for dry eyes, or simply understand the biology, the process starts in small glands tucked behind the upper outer corners of your eyes. From there, what triggers those glands to release fluid depends on whether the tears are emotional, reflexive, or simply keeping your eyes moist.
How Your Body Produces Tears
Tears originate in the lacrimal glands, which sit behind the bone just above each eye’s outer corner. These glands produce the salty water that forms the bulk of every tear. But water alone isn’t a tear. Oil glands along the edges of your eyelids (called meibomian glands) add a thin lipid layer that prevents the watery base from evaporating too quickly. The result is a three-layered film: an inner mucus layer that helps tears stick to the eye’s surface, a middle water layer, and an outer oil layer that seals everything in.
Your facial nerve, the seventh cranial nerve, controls the muscles that pump tears into and out of your eyes. This nerve connects your brain’s emotional and sensory processing centers directly to the tear-producing machinery, which is why a sad thought or a grain of sand can both make you cry, through completely different pathways.
Three Types of Tears
Not all tears are the same. Your eyes constantly produce basal tears, a thin film that lubricates and protects the cornea with every blink. You never notice these because they work in the background, keeping your eyes from drying out.
Reflex tears flood your eyes in response to irritants like smoke, wind, or onion fumes. They’re more dilute than other tear types and contain higher concentrations of antimicrobial compounds that help fight off infection from whatever triggered them.
Emotional tears are chemically distinct. They contain more protein, making them thicker and stickier. This is why emotional tears cling to your cheeks and roll down your face slowly instead of sheeting off. Research published in Cureus found that negative emotional tears (from sadness or frustration) activate different brain pathways than positive emotional tears (from joy or relief). Negative tears are linked to serotonin and hormone-regulating pathways, while positive tears correlate with entirely different metabolic processes. Your body literally cries differently depending on the emotion.
How to Cry on Command
Actors and performers often need to produce tears without genuine emotion. Several techniques work reliably:
- Emotional memory: Recall a specific, vivid moment of sadness or loss. The more sensory detail you bring to mind (a smell, a voice, the texture of a specific object), the more likely your brain will activate the same emotional pathways that produce real tears.
- Staring without blinking: Hold your eyes open as long as you can. After 30 to 60 seconds, your reflex system kicks in to rehydrate the surface, producing visible tears. This works faster in dry or air-conditioned rooms.
- Yawning repeatedly: Yawning compresses the lacrimal glands and stimulates tear release. Three or four deep yawns in a row will often produce watery eyes.
- Onion vapor: When you cut an onion, an enzyme converts sulfur compounds into a volatile gas that drifts into your eyes and triggers pain receptors on the cornea. Your reflex tear system responds immediately with a flood of dilute tears to wash the irritant away. Even holding a freshly cut onion near your face works.
- Menthol-based products: Some performers use menthol tear sticks or balms applied just below the eyes. The cooling vapors irritate the eye surface enough to trigger reflex tears without touching the eye itself.
How to Produce More Tears for Dry Eyes
If your concern is chronically dry, irritated eyes, the goal shifts from triggering a single cry to increasing your baseline tear production over time. Several approaches target different parts of the problem.
Omega-3 Fatty Acids
The oil layer that prevents tears from evaporating depends on healthy output from the meibomian glands along your eyelid margins. Omega-3 fatty acids, found in fish oil and flaxseed, help restore this lipid layer. A 2023 meta-analysis of randomized controlled trials found that higher daily doses of omega-3 correlated with greater improvements in tear stability, tear volume, and dry eye symptoms. Studies used doses up to 3,000 mg per day, with formulations higher in EPA (a specific type of omega-3 found in fatty fish) showing the strongest effects. Benefits appeared within weeks but continued improving over months of consistent use.
Nasal Spray Treatment
A prescription nasal spray works by activating a natural reflex that connects your nose to your tear glands. When nerve endings inside the nasal cavity are stimulated, signals travel along a pathway that tells the lacrimal glands to produce tears. In two large clinical trials, patients using this spray twice daily produced roughly twice the tear volume of those using a placebo after four weeks. About 47% of treated patients achieved a clinically meaningful increase in tear production, compared to 28% with placebo.
Punctal Plugs
Rather than making more tears, this approach keeps the tears you already produce from draining away too quickly. Tiny plugs are inserted into the small drainage openings (puncta) at the inner corners of your eyelids. The procedure takes minutes and is painless. Temporary plugs made from collagen dissolve in five to seven days, which lets you test whether the approach helps before committing. Semi-permanent versions last weeks to months. Permanent silicone plugs stay in place indefinitely but can be removed if needed. Some designs have a hollow center that slows drainage rather than blocking it completely, reducing the risk of overly watery eyes.
Environmental and Behavioral Changes
Simple adjustments often make a noticeable difference. Blinking more frequently, especially during screen use, mechanically spreads tears across the eye and stimulates fresh production. Positioning your computer screen at or below eye level reduces the exposed surface area of your eye, slowing evaporation. Using a humidifier in heated or air-conditioned rooms keeps ambient moisture higher so your tear film lasts longer between blinks. Warm compresses held over closed eyes for five to ten minutes soften the oils in your meibomian glands, improving the quality of the tear film’s protective outer layer.
Why Some People Can’t Cry
Difficulty producing tears, whether emotional or physical, can stem from several causes. Certain medications, particularly antihistamines, decongestants, and some antidepressants, reduce tear gland output as a side effect. Aging naturally decreases production, with post-menopausal women affected most due to hormonal shifts in estrogen signaling that directly influence tear chemistry. Autoimmune conditions can damage the lacrimal glands themselves. And emotional numbness from depression, trauma, or chronic stress can suppress the neurological signals that trigger emotional crying, even when the physical machinery works fine.
If you find yourself unable to cry emotionally but your eyes still water when you yawn or chop onions, the issue is likely neurological or psychological rather than glandular. If neither emotional nor reflex tears come easily, the lacrimal glands themselves may need evaluation.