Why do cats purr?
Quick answer
Cats purr mostly when they’re relaxed and content, but purring is really a way to communicate and self-soothe. Cats also purr when they’re hungry, nervous, in pain or giving birth. Kittens purr to tell their mother they’re fine, and adult cats keep using it to ask for care and attention.
Purring starts early. Kittens can purr when they’re only a few days old, while nursing, and the mother purrs back. That first “everything is OK” signal stays with cats for life.
How do cats purr?
The sound comes from the voice box (larynx). Muscles there twitch rapidly, opening and closing the vocal folds as the cat breathes in and out, which is why purring sounds continuous. The vibration usually sits at about 25 to 150 Hz.
What different purrs mean
| Situation | Likely meaning |
|---|---|
| Curled up on your lap, slow blinking | Contentment and trust |
| Weaving around your legs at breakfast time | “Feed me.” Some cats mix a high-pitched cry into this solicitation purr, which people find hard to ignore |
| At the vet or after a scare | Self-soothing, like humming when nervous |
| When ill or injured | Comfort, and possibly healing (see below) |
| Mother with kittens | “I’m here, you’re safe.” |
Read the whole cat, not just the sound. A relaxed body and soft eyes mean happiness; flattened ears, a tense body or hiding suggest stress or pain.
Can purring heal?
Some scientists think it might. Vibrations in the 25 to 150 Hz range are similar to frequencies used in therapies to help bones and tissues heal. One theory is that purring helps keep cats’ bones strong while they rest for long hours. It’s an interesting idea, but it hasn’t been proven.
Do big cats purr?
Cheetahs, pumas, lynxes and bobcats purr. Lions, tigers, leopards and jaguars mostly can’t purr continuously; their voice boxes are built for roaring instead. Read about jaguars’ famous spots and the fastest cat on land.
If a cat suddenly purrs a lot while also hiding, not eating or acting differently, it’s worth a check-up with a vet.
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