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Researchers have analyzed the purrs of many different cats and have determined that the sounds we make are mostly within the range of 20 to 140 hertz. Experiments have shown that vibrations in this range are therapeutic for bone growth, pain relief, mending fractures, reducing swelling, wound healing, muscle growth and repair, breathing difficulties, and relieving migraines. So, when we cats get injured, we may purr to stimulate our own healing. What’s more – since we know we have this ability – we will often cuddle up and purr when our human companion in hurt or sick, because we want to help.