Some of the most unsettling horror taps into a primal and very real fear: that our bodies will somehow turn on us. It’s the sort of case where only the severity needs to be increased for a taste of the uncanny to emerge. We wrestle with our own bodies’ failures all the time, from chronic conditions to sudden illnesses. We struggle with our own health and we reckon with the health of those closest to us. Horror doesn’t need to do much to strike a chord here.