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Purring is most often associated with contentment or pleasure. Cats have also been found to purr under extreme stress.
If you have concerns about a cat that purrs excessively or not at all, make an appointment with your vet.

en.wikipedia.org/wiki/Purr

A purr is a tonal fluttering sound made by some species of felids, and two species of genets. ... respiratory variation[edit]. Domestic cats purr at a frequency of 20 to 30 vibrations per second. .... Why do cats purr? Why do Cheshire cats grin?

pets.webmd.com/cats/why-do-cats-purr

Purring is the most common sound cats make. Yet we know less about it than meowing, chirping, chattering, hissing, and growling. Yes, cats purr when they're  ...

www.mnn.com/family/pets/stories/why-do-cats-purr

Jul 16, 2015 ... Have you ever wondered why cats purr? It's easy to assume that cats purr because they're content, but research shows that purring is a means ...

www.catster.com/lifestyle/why-do-cats-purr-cat-behavior-health-evolution

Jul 24, 2017 ... Cats purr because they're content, right? Yes, but that's not always the case. Discover some of the incredible reasons why cats purr.

www.ask.com/youtube?q=Why+do+cats+purr%3F&v=7KowU4tPi7Q
Apr 4, 2013 ... The smaller members of the felid family can purr, but why? Hank takes on this most adorable of life's mysteries in todays episode of SciShow.

www.purina.com.au/cats/behaviour/purring

There is nothing better than a cat curled up on your lap, satisfied and happy, but have you ever wondered just how cats purr and why they do it? Humans smile ...

metro.co.uk/2017/07/31/why-do-cats-purr-and-what-do-they-want-when-they-meow-6819086

Jul 31, 2017 ... Got a feline friend who is always humming you their kitty song? Cats purr when they are happy but also when they are frightened or feel ...

www.wired.com/2015/05/why-do-cats-purr

May 8, 2015 ... Why is your cat purring? He might be happy to see you, or hungry, or hurt...or he might just be trying to regenerate his bones.

www.rd.com/advice/pets/why-do-cats-purr

Cats don't just purr when they're happy, so why do they do it? Research shows some surprising reasons answering why cats purr.