Why does it hurt when I have to raise my arms to do something?

Sometimes a wandering weakness in the muscles can cause us to perceive that our range of motion is limited. This weakness often migrates – disappearing from one place and reappearing elsewhere, limiting that range of motion instead. Don't push yourself beyond the comfortable limits if you can avoid it. This will only lead to stress, and could cause a flare. Remember that what you can't move today – as long as the problem is strictly fibro-related – may move easily tomorrow.