Be it a twisted ankle, a herniated disc, a splitting headache, crippling menstrual cramps or any sort of chronic pain that flares up, pain freaking sucks. Say that old knee injury likes to come back to haunt you on occasion. Do you reach for the hot water bottle or the ice pack? What about a swollen ankle? The experts at Cleveland Clinic explain in this neat infographic when you should treat your pain with ice, when you should treat it with heat and why.