Cats can purr for various reasons, using the soft rumble as a way of communicating and as a form of self-soothing or even healing. This is why cats will often purr when they're injured, or after a stressful event.
The primary stress hormone Cortisol increases the blood supply of sugar (glucose), enhances the use of glucose by your brain and increases the availability of tissue - repaired materials.
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i think inflammation of the pericardial sac
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