Yes, it can be. But the higher ESR the pain and stiff we'll suffer. My ESR recently is 50-60. And it has been for 12 years. But i have 1 year experience when my doctor give me steroid frequently, my ESR drop to 20 and my stiff and pain is almost all gone.

My doctor before said that ESR related to the progressiveness of the AS and how much joint tissue has been inflammation in my body