Why Does Mint Feel So Cold? The Science of Coolness Explained

That familiar cooling sensation from mint – in gum, toothpaste, or even a sprig of the herb – isn’t a trick of the mind, though it certainly feels that way. Scientists have finally captured a detailed view of how our bodies perceive “cool,” revealing the molecular mechanisms behind why mint feels cold, and it all comes down to a microscopic sensor called TRPM8.

Our skin, mouths, and eyes are equipped with temperature-detecting sensory nerves, crucial for identifying safe environments and substances. A key player in this process is the TRPM8 (transient receptor potential melastatin 8) receptor. This receptor activates when temperatures drop between 10° and 28°C (46° and 82°F), allowing ions to flow into nerve cells and sending a “cool” signal to the brain. But TRPM8 doesn’t just respond to temperature. it’s as well activated by menthol, the aromatic compound abundant in mint plants.

How Menthol ‘Tricks’ Your Brain

Menthol’s cooling effect isn’t new knowledge. As early as the 1950s, researchers suspected a link between menthol and cold receptors, but the precise mechanism remained elusive until recently. Using cryo-electron microscopy – a technique involving freezing and imaging molecules with an electron beam – scientists at Duke University have now visualized how menthol interacts with TRPM8. The research, presented at the 70th Biophysical Society Annual Meeting in February 2026, reveals that menthol and cold activate the receptor in different ways.

Cold directly impacts the “pore” of the TRPM8 receptor, opening it to allow ion flow. Menthol, however, binds to a different part of the receptor, altering its shape and *forcing* the pore open. “Menthol is like a trick,” explains Hyuk-Joon Lee, a postdoctoral fellow involved in the study. “It attaches to a specific part of the channel and triggers it to open, just like cold temperature would. So, even though menthol isn’t actually freezing anything, your body gets the same signal as if it were touching ice.”

This explains why the cooling sensation from mint can feel even more intense when combined with actual cold. Due to the fact that menthol and cool temperatures activate TRPM8 through distinct pathways, their effects compound each other. Ever notice how icy water feels even colder after brushing your teeth with mint toothpaste? That’s this combined effect in action.

Beyond a Cooling Sensation: The Evolutionary Role of Menthol

Mint plants produce menthol as a natural defense mechanism. The intense cooling sensation in the mouth acts as a deterrent to predators, discouraging them from consuming the herb. This evolutionary adaptation highlights the power of sensory manipulation in the plant kingdom. It’s a fascinating example of how plants have evolved to protect themselves through interactions with animal nervous systems.

Implications for Pain Relief and Beyond

Understanding how menthol interacts with TRPM8 has significant implications for medical treatments. Menthol is already a common ingredient in topical ointments used to alleviate muscle soreness, arthritis, and even migraines. Its cooling sensation provides distraction from pain, and at higher doses, it can desensitize pain receptors. You can discover more information about migraine treatments on the Psychology Today website.

The compound is also frequently found in decongestants and lozenges, where it numbs the throat and eases breathing by cooling the airways. However, the potential extends beyond these established uses. Recently, the FDA approved acoltremon, a menthol derivative, to treat dry eye. This drug activates TRPM8 receptors in the eye, stimulating tear production and relieving irritation. You can review the FDA label for acoltremon here.

Menthol and Athletic Performance

Interestingly, menthol is even being explored as a potential sports supplement. A study published on Wiley Online Library demonstrated that runners who used a menthol mouth rinse during training reported feeling less hot and subsequently ran faster in a 5-kilometer time trial. Surprisingly, drinking an ice slushie lowered the runners’ body temperature but didn’t provide the same performance boost.

Christopher Stevens, Associate Professor of Sport and Exercise Science at Southern Cross University, suggests that the psychological effects of menthol are just as important as its physiological effects. As he observes, “How hot you feel may be more important than how hot you are.” This highlights the complex interplay between perception and performance.

Future Research and the TRPM8 Receptor

The detailed images of TRPM8 and its interaction with menthol represent a significant step forward in our understanding of how we perceive temperature and cooling sensations. Further research is needed to fully elucidate the nuances of TRPM8 activation and its role in various physiological processes. Scientists are also investigating how TRPM8 interacts with other compounds and stimuli, potentially leading to new therapeutic targets.

The TRPM8 receptor is expressed in dorsal root and trigeminal ganglion neurons, and is the sensor for cold (8° to 28°C) and chemically induced coolness (3). Understanding the mechanisms of sensory adaptation and inhibition of this receptor, as detailed in research published on Science.org, could unlock even more possibilities for manipulating the perception of temperature and pain.

What’s next? Researchers are now focusing on exploring the potential of TRPM8 modulation for a wider range of conditions, including chronic pain, inflammatory diseases, and even certain types of cancer. Clinical trials are underway to assess the efficacy of novel TRPM8-targeting therapies, and ongoing research continues to refine our understanding of this fascinating and versatile receptor.