That low rumble coming from your cat is one of the most recognizable sounds in the animal kingdom. But purring isn't always what it seems.
The Basics
Cats purr by rapidly contracting and relaxing the muscles in their larynx, creating vibrations at 25–150 Hz. These frequencies have been shown to promote tissue healing — which may explain why cats purr even when they're injured or stressed.
Why Cats Purr
- Contentment — The classic reason. A relaxed cat on your lap is probably purring because they're happy.
- Self-soothing — Cats also purr when anxious, in pain, or recovering from injury. It's a comfort mechanism, not just a sign of pleasure.
- Communication — Kittens purr from birth to communicate with their mother. Adult cats sometimes use a "solicitation purr" — a higher-pitched purr mixed with a cry-like frequency — to get your attention at feeding time.
- Healing — The vibration frequency of purring (25–50 Hz) is in the range used in therapeutic medicine to promote bone density and wound healing.
When to Pay Attention
Purring alone is rarely a concern, but if your cat is purring while also:
- Hiding or avoiding interaction
- Refusing food or water
- Showing signs of pain (limping, flinching when touched)
- Breathing rapidly or with effort
...it may be a stress or pain response rather than contentment. A vet check is worthwhile if the behavior is new.
What Owners Found
On Mylo, cat owners frequently note that their cats purr more during seasonal changes and vet visits — both stressful situations. The consensus: purring is usually a good sign, but context matters.