Dad had pmr and was on prednisone, he weaned off but 7 months later he has severe joint pains w/ no inflamitory markers all over. prednisone effect?

Suspect PMR relapse: It's very common to have a relapse in Polymyalgia Rheumatica.Depending on the study the average time a patient with PMR requires prednisone is 3-6 years. Although very uncommon, patients with PMR can have a normal ESR.Was a CRP done?Because patients with PMR have a dramatic response to even small doses of prednisone(15-20 mg daily) most physicians would restart prednisone and expect quick response