How it works
Research indicates that rapid muscle and vocal-fold activity in the larynx produces the repeating vibration during breathing. Kittens and mothers use purring as part of early communication.
What people often miss
Body posture, appetite, activity, and the surrounding situation are necessary for interpreting a purr. A cat that purrs while showing signs of illness still needs attention.
Why this question comes up
The comforting sound has a more complicated meaning than its popular reputation suggests.
Key points
- Cats purr in several situations, including relaxation, social contact, nursing, stress, and pain, so the sound is not a simple happiness meter.
- Research indicates that rapid muscle and vocal-fold activity in the larynx produces the repeating vibration during breathing. Kittens and mothers use purring as part of early communication.
- Body posture, appetite, activity, and the surrounding situation are necessary for interpreting a purr. A cat that purrs while showing signs of illness still needs attention.
Bottom line
Cats purr in several situations, including relaxation, social contact, nursing, stress, and pain, so the sound is not a simple happiness meter.
Source and verification
This Answer was checked against Cornell Feline Health Center. Follow the source for the full official explanation and any later updates.