I get severe muscle cramps in my rib cage. I can feel the muscle move and I can hardly stand it!!!! I take vitamins, gatoraide, and drink water. When the cramps occur, I eat 2 Tbl of mustard, and drink water until it goes away --in about 5 min. I sometimes get them in my calf and thighs also. I started getting them about 20 years ago, and they are getting more frequent.