Written by Rene Knapp, long time TICA member and dedicated cat lover.
Introduction to Purring
The Science Behind Purring
Purring is produced by the rapid movement of muscles within a cat’s larynx(voice box), combined with the diaphragm. As these muscles twitch, they cause the vocal cords to separate, producing a continuous, rhythmic sound as the cat inhales and exhales. Unlike meowing, which requires deliberate effort, purring is largely an automatic response.
Scientists have discovered that the frequency of a cat’s purr usually falls between 25 and 150 hertz. These low-frequency vibrations are particularly interesting because they align with ranges known to promote tissue regeneration, bone healing, and pain relief. This may explain why cats often purr when injured or unwell, suggesting that purring could play a role in self-healing.
Why Do Cats Purr?
Communication
One of the most common reasons cats purr is for communication. Cats may purr when they’re content, such as while being pet or resting in a familiar environment. Purring can also serve as a request, as cats have been domesticated and understand humans as a source of food and affection. Many cats have a distinct solicitation or request purr when asking for food or attention, which often sounds slightly higher-pitched or urgent.
Comfort and Relaxation
Cats frequently purr when they feel safe and relaxed. It’s a way to self-sooth, similar to how humans might hum or take deep breaths when content. For kittens, purring is an important survival mechanism. Nursing kittens purr to bond with their mother, who in turn uses purring to reassure and comfort them.
Healing Powers
Students suggest that purring can have therapeutic benefits for both cats and humans. The low-frequency vibrations may promote bone density, reduce pain, and accelerate healing in cats recovering from illness or injury. For humans, the sound of a cat’s purr can reduce stress, lower blood pressure, and create a calming atmosphere. Many cat owners describe it as a natural form of relaxation therapy.
When Purring May Signal Illness
Although purring is often a sign of happiness, it’s important to recognize that cats may also purr when they’re anxious, injured, or sick. Cats sometimes use purring as a self-comforting mechanism during stressful situations, including visits to the vet.
Signs that your cat’s purring may indicate discomfort or illness include:
- Purring combined with hiding or avoiding interaction
- Loss of appetite or sudden weight loss
- Rapid or labored breathing while purring
- Purring accompanied by limping or visible pain
- Uncharacteristic changes in behavior, such as aggression or withdrawal
If your cat’s purring seems unusual or is paired with other symptoms, consult a vet to rule out any underlying health concerns.
Benefits of Purring
- Stress Relief: The sound and vibration of purring can reduce anxiety in both cats and people.
- Bonding: The soothing effect of purring strengthens the emotional connection and bond between cats and humans.
- Healing: Purring may promote physical healing in cats, helping them recover from injuries or illness.
- Human Wellness: Cat owners often report feeling calmer, happier, and less stress when listening to their cat purr.
