I began taking cats claw for tendinitis in my arms. It worked better than any other anti inflammatory I have tried. But at the same time an old chronic injury of the IT band in the hip began to re-occur. In fact it got worse than ever before and spread to the right hip. I stopped taking cats claw and my hip pain diminished. All this was within a three day period. I can't be certain that the cat's claw promoted my hip pain but I'm pretty sure it did. After discontinued use of the herb my arm pain came back. So now I must choose between arm pain and hip pain. Does anyone have a possible explanation for this?