My doctor started me on the Medrol dose pack yesterday. It's a tapering dose that starts with 6 pills the first day, 5 the next, and so on. I took my first dose yesterday and second today. This evening I was feeling fine up until about midnight when I suddenly developed severe arm pain. I'm not sure if it's muscular or joint pain, but I'm suspecting it's my joints, because my wrists and elbows (especially my right arm) are warm to touch. I've taken Medrol before and never had this happen. I've also taken Prednisone, among others. Has anyone else had this happen? Does this warrant a call to the doctor in the morning, or will it go away?