 [ Symptoms ] can prednisone cause fibromyalgia  i believe that i took prednisone too long and it caused my muscle pain which was diagnosed as fibromyalgia i also believe that there is not a doctor in the world that would admit to this since they benefit a lot financially from prescribing this dangerous steroid in my case i took it for months my face was swollen gained weight etc what do you think [ Disease ] prednisone has plenty of side effects but it can be very beneficial when properly used it does not cause fibromyalgia however as a matter of fact no one really knows what causes fibromyalgia