Research overview: purring in distress versus contentment

Although purring is popularly equated with happiness, cats also purr when injured, frightened, giving birth or near death, prompting research into the contexts and possible functions of the behaviour. This overview surveys observations and acoustic analyses distinguishing contentment purrs from solicitation and stress-related purring, and it examines hypotheses that purring serves self-soothing, communication or appeasement functions in addition to signalling comfort. It discusses how the same broad behaviour can carry different meanings depending on situation, body posture and accompanying vocalizations, and how acoustic features like the embedded cry can shift a purr's communicative intent. The survey emphasizes that purring is best understood as a multifunctional signal rather than a simple index of positive emotion, with meaning inferred from context.