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

Mar 21, 2014 ... Cats are evolutionary masterpieces of design. They have evolved in such a way that many of their characteristics, including behaviors, are ...

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 ...

www.drsfostersmith.com/pic/article.cfm?articleid=892

When a cat is purring, it is almost impossible to hear the cat's heart or lungs very well, ... Older cats purr when they play or approach other cats, signaling they are  ...

www.loc.gov/rr/scitech/mysteries/catspurr.html

Although some big cats like lions exhibit a purr-like sound, studies show that the ... Cat Guide provides information on many cat questions such as “Why do cats ...

.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.