I get them all the time especially lately. Mine just twitch all over but they don't actually cramp up. I am not sure what is causing them but I am going to ask my rheumy next visit, if I get answers I'll post them..
Fibro, RA, IBS, Anxiety, insomnia,(Pluersy, Pericarditis, and now Vasculitis) in the last three months
Meds: Serax 10mg, Mobic 15mg, Prednisone 15mg, Prilosec 20mg, Vicodin 5/500, Flonase, Calcium and magnesium, Robaxin 500mg, Nortriptyline 50mg, Baby aspirin 81 mg, zocor 20 mg