Muscle/intestinal spasm. Believe it or not, I get those it my right-side butt...ain't no way there's ababy growing in there!!! I get these under my rib cage too...they usually don't hurt...just crazy spasm that is so wierd feeling it almost tickles...I'm not sure what I feel befoer or right after...I'll have to pay attention next time.
Hope you are feeling okay today.
Love,
Janet