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There are those quiet, comforting moments your cat curls up beside you and begins to purr. It feels like a simple sign of contentment. But what is actually happening behind that soft, steady sound.
Purring is a surprisingly complex process. It comes from rapid, repeated contractions of the muscles in a cat’s larynx, located in the throat. As air moves in and out during breathing, these muscles vibrate, producing a continuous, gentle sound, often compared to a small engine.
So why does your cat purr louder than the neighbour’s?
It can come down to several factors. First, muscle “strength”: more developed laryngeal muscles can produce stronger vibrations and therefore a louder sound. Airflow also plays a role: the deeper the cat’s breathing and the more air it moves, the more audible the purr.
Of course, just like human voices, some cats are naturally quiet while others sound like proper “tractors”. Emotional state matters too: a very relaxed cat or one that really wants something may purr more loudly, for instance to get your attention.
It’s well known that cats purr when they’re content – when we give them a good scratch or when they’re relaxing beside us – but also to let us know they want attention… or food.
What’s less widely known is that our furry companions also use purring to soothe themselves: when they’re frightened, in pain, stressed, or even at the end of their lives, as a way of comforting themselves.
That’s because purring may have some hidden powers. In cats, researchers believe these low frequencies can help repair bones, tendons and even muscles. It’s not magic, but a remarkable biological effect: purring frequencies between 25 and 150 Hz are known to stimulate bone repair, promote tissue healing, and reduce pain and inflammation.
Some studies even suggest that purring could have benefits for humans too – improving bone density, aiding muscle recovery, and possibly even easing pain. At the very least, it helps reduce stress and anxiety, and can even slow the heart rate.
In the end, that little sound we love so much isn’t just a sign of happiness.
It’s a language.
A mechanism.
And perhaps even… a superpower.
Thought your cat was amazing? Turns out you were absolutely right :)
