Why does a cat make a purring sound when being petted?

When a cat purrs while being petted, it means the cat feels very comfortable. Cats typically purr when relaxed or content, so there is no need to worry; this is a normal physiological reaction and a way for the cat to express its mood, showing that it is enjoying your touch.

However, a cat that is seriously ill or feeling unwell may also make a purring sound, usually accompanied by abnormal signs such as poor spirits and reduced appetite. Owners can judge based on the cat’s actual condition.