The Science of Tears: Why Crying Might Be the Ultimate Biohack for Stress Relief

There’s a strange moment after a good cry—when your breath steadies, your body feels lighter, and the weight pressing against your chest suddenly lifts. It’s as if your entire nervous system lets out a sigh of relief. But why? What is it about crying that makes it so paradoxically painful yet cathartic?

Most of us have been conditioned to see crying as a sign of weakness—something to stifle, hide, or apologise for. But the reality? Crying is an evolutionary masterpiece. A biological cheat code. A neurochemical reset button that allows your body to purge stress, regulate emotions, and rebalance essential hormones like cortisol.

Yes, the very stress hormone that’s been slowly cooking you from the inside out.

Crying: Your Body’s Built-in Stress Detox

Let’s get into the science. When you cry, your body isn’t just throwing a tantrum—it’s engaging in a complex physiological process designed to bring you back to homeostasis. Emotional tears (the kind that stream down your face after a gut-wrenching film or a particularly bad day) are chemically different from the ones you produce when chopping onions. They contain higher levels of stress hormones, including cortisol and adrenocorticotropic hormone (ACTH), as well as leucine-enkephalin, a natural painkiller (Vingerhoets, 2013).

Translation? When you cry, your body is literally excreting stress.

Research from the University of South Florida found that crying can activate the parasympathetic nervous system, which is responsible for rest and digestion (Bylsma et al., 2011). That post-cry calmness? It’s your nervous system flicking the switch from ‘fight or flight’ to ‘rest and recover’—a physiological shift as crucial to your well-being as sleep.

Cortisol, Crying, and the Silent Impact of Chronic Stress

Here’s where things get interesting. Cortisol is your body’s primary stress hormone, designed to mobilise energy in times of threat. A little cortisol is great—it helps you wake up in the morning, focus, and react quickly in danger. But chronically elevated cortisol? That’s where the damage starts.

Persistently high cortisol levels have been linked to everything from anxiety and depression to gut issues, insulin resistance, and even memory loss (McEwen, 2007). Over time, chronic stress can lead to HPA axis dysfunction (your body’s stress-response system going completely off the rails), which has been implicated in conditions like burnout, adrenal fatigue, and cardiovascular disease (Chrousos, 2009).

And here’s the kicker: most people have no idea what their cortisol levels are doing until it’s too late.

Why You Might Want to Check Your Cortisol Levels

If you’ve ever felt exhausted but wired, struggled with unexplained weight gain, or found yourself constantly teetering on the edge of burnout, your cortisol levels might be out of sync. And while crying is an incredible natural regulator, it’s only part of the puzzle. Understanding your body’s unique stress response can be game-changing, allowing you to take control of your health before chronic stress wreaks havoc.

At Vitall, we offer an at-home Cortisol (Stress) Test that provides real insights into your body’s stress response. Unlike a single blood test, our test analyses cortisol patterns throughout the day, giving you a full picture of how your body handles stress.

Because here’s the truth: your body is always communicating with you. Crying is one way it tells you that your stress levels are too high. Testing is another way to listen.

The Takeaway? Cry Freely, but Test Smartly

Next time you feel tears welling up, don’t fight them. Your body knows what it’s doing. Let the stress hormones flow out. Embrace the biological reset. But if you’re feeling perpetually drained, foggy, or overwhelmed? It might be time to dig deeper.

Because real control over your health doesn’t come from ignoring symptoms—it comes from understanding them. And sometimes, the most powerful thing you can do is listen.