For just over a week I have had a very painful left knee and my right one is becoming painful - is this a flare up? Slight discomfort in my shoulders. I have GCA and have got down to 4mgs. Prednisolone daily, been on that for nearly two months now, but I am finding it difficult to know if this is a flare, or have I damaged my knee. I had a blood test today for ESR and CRP, so that may indicate if it is a flare, but really not sure - anyone with any ideas please.