Tyson,
I have muscle spasms in my rib cage and sometimes in my feet at night. The ones in my side and ribs are painful and I literally have to get up and stretch them out. I agree with the others that it is from a lack of Potassium. I notice mine are much worse on days I don't get enough. I don't take any supplements but do try to eat a banana every single day. I also drink the low sodium V-8 juice. I'm not a fan of broccoli but my Drs. nurse told me it has a good amount of potassium in it too. I can also tell you the body responds pretty quickly to it. I try to drink V-8 juice in the morning and then eat a banana at some point through the day and if I do this the spasms are minimal if any. Hope this helps.
Kendra