Watch the That Hurts online guitar lesson by Jeff McErlain from Blues Guitar Fakebook: Rhythm Vol. 2
"That Hurts" uses the classic changes from "It Hurts Me Too", which is basically the same as "Sitting on Top of the World" and other blues classics. My favorite version of this tune is by the great Elmore James. Sonny Landreth did a great version of it as well for us guitar nerds!