Cats purr for several reasons, and it’s not always because they’re happy! Purring is a way cats communicate their feelings, interact with people and other animals, and sometimes cope with stress or discomfort.
1. They’re happy and content
This is the reason most people associate with purring. Your cat may purr while being petted, curled up on your lap, or relaxing in a favorite sunny spot. A relaxed body, soft eyes, and slow blinking are additional signs of contentment.
2. They’re communicating with you
Cats often purr to get your attention, ask for affection, or encourage you to keep petting them. Some cats also purr when they want food, especially around their usual mealtime.
3. They’re bonding with their mother
Kittens can begin purring when they’re very young. Purring helps kittens and their mothers communicate during nursing and supports bonding between them.
4. They’re nervous or stressed
Cats sometimes purr in unfamiliar environments, during travel, or at the veterinarian. Purring may help them self-soothe, even when they’re feeling frightened rather than happy.
5. They’re coping with pain or discomfort
A cat may purr when injured, ill, or uncomfortable. If your cat is purring while hiding, eating less, moving differently, or acting unusually quiet, don’t assume everything is fine.
6. They’re soothing themselves
Purring often accompanies kneading, resting, and settling down to sleep. Researchers have suggested that purring may have self-soothing effects, although its full biological role is not completely understood.
Cats produce purring through repeated activity of muscles in the larynx (voice box), which causes the vocal folds to vibrate as air moves in and out during breathing. This creates the familiar rumbling sound you can often feel when your cat rests against you.
Interestingly, cats can purr during both inhalation and exhalation, allowing them to produce a relatively continuous sound.
Possibly, but the evidence is limited. Cat purrs often fall within a range of frequencies that has attracted scientific interest because certain low-frequency vibrations have been studied for potential effects on bone and tissue. However, there isn’t strong evidence that a cat’s purr directly heals injuries or illnesses.
Purring by itself is usually nothing to worry about. Pay attention to the rest of your cat’s behavior.
Likely content: relaxed posture, normal appetite, playful behavior, and seeking affection.
Potentially stressed: flattened ears, a tucked tail, hiding, or tense muscles.
Potentially unwell: reduced appetite, unusual lethargy, limping, or changes in litterbox habits.
Contact your veterinarian if purring accompanies concerning behavior or other signs of illness.
One interesting fact: Domestic cats aren’t the only animals that purr. Some wild cat species, including cheetahs and bobcats, can purr, too.