Michael Dylan Foster

“Symptoms of kitsune-tsuki varied. There are descriptions of “afflicted persons who ate gravel, ashes, hair, or combs, wandered the mountains and fields making piles of stones, jumped into rivers or ran into the mountains, etc.”29 In 1894, Lafcadio Hearn wrote, “Strange is the madness of those into whom demon foxes enter. Sometimes they run naked shouting through the streets. Sometimes they lie down and froth at the mouth, and yelp as a fox yelps.”30 Kitsune-tsuki (and other forms of possession) persisted throughout Hearn’s time, and similar phenomena are still occasionally identified today. But during the Meiji period, modern Western medicine was called on to redefine fox possession as a form of mental illness treatable by psychiatrists.”
― Michael Dylan Foster, The Book of Yokai: Mysterious Creatures of Japanese Folklore