Why do cats purr

Purring is the sweet and soft vibrating noise of a cat. It comes from the cat’s larynx, which surrounds its vocal chords. As a cat purrs, part of its larynx is restricted and vibrates the surrounding air, creating a purring sound.

Why do cats purr?

Purring is the most common sound cats make. Some purr a little, some purr a lot - for some purring is a delicate little sound and for others, you can hear it in the next room! Normally, we humans think cats make this sound when they are happy and relaxed. But, there are also other reasons why cats purr.

It starts when they are kittens

When your cat was a tiny kitten, they would have started to purr when they were just a few days old. On returning to the den, their mother would purr to quietly let them know that she was home and that all was well, without alerting predators. The kittens purr back in return, helping mum to find them and letting her know they are feeling okay. It also helps the two of them to build a strong bond. From an early age, purring is something your cat does to signify their comfort and as a way to communicate.

How do cats purr?

Cats purr through a unique process involving their larynx (voice box) and diaphragm. The purring sound is created when the brain sends repetitive signals to the laryngeal muscles, causing them to tighten and relax rapidly. This vibration opens and closes the vocal cords, producing the distinctive purring noise as the cat breathes in and out. Remarkably, this process doesn’t interrupt their breathing, allowing them to purr continuously while resting, eating, or even moving around. This natural mechanism is one of the many fascinating traits that make cats so unique.

Does purring mean my cat is happy? 

We assume purring is the noise cats make when they are happy and calm. If their eyes are soft and their tail is relaxed while enjoying a stroke or a cuddle, this is probably the case. Cats may also purr when they are playing, especially during moments of gentle interaction. It’s their way of expressing joy and connection. However, happiness isn’t the only reason for purring, so it’s important to consider their body language and environment to fully understand how they’re feeling.

Here are some more common reasons why cats may purr:

Time for tea

Cat’s purr when they are ready for their dinner, sometimes accompanied by a mewing noise. If you hear this purring/ mewing combination, it might be time to get them a bowl of food!

Feeling pain

Sometimes, when cats are uncomfortable or in pain, they can purr as a way of soothing and comforting themselves. Think of how a child may suck their thumb if they feel unwell. Cats do the same by purring.

Getting better

When cats injure themselves after being out on their adventures, it is believed purring can help speed up the healing process. The vibrations that come from purring can help to ease breathing and decrease swelling and pain. It also helps heal wounds and repair muscle injuries.

It’s true to say, we can’t be entirely sure why cats purr. It appears to depend on the cat and the situation they find themselves in. Compared to studies on dogs, currently, very little is known about feline psychology and behaviour. But, hopefully, this will change into the future as more studies are undertaken into our fabulous felines so we can learn more about how they see the world.

Why are cat purrs so soothing to humans?

Cat purrs produce low-frequency vibrations, typically between 25 and 150 Hertz. These frequencies are believed to have calming effects on the human brain, reducing stress and anxiety. Listening to a cat's rhythmic purring can slow your breathing and lower blood pressure, creating a sense of peace and relaxation. The sound is often associated with contentment and warmth, making it emotionally comforting. Additionally, the gentle vibrations may resonate physically, promoting a sense of well-being similar to the effects of certain therapeutic sound frequencies. This combination of physical and emotional benefits makes a cat's purr wonderfully soothing.

For more information about cat behaviour, read our guide.

FAQs about cats purring