What Could Cause Pain In The Body At Odd Hours And Different Spots?

Is there something that would cause severe and very random pains throughout the body? I frequently experience pain in random and isolated places, such as a single toe, my abdomen, or the right side of my chest. These occur for no apparent reason, and usually go away after a few hours. It is very frustrating because though I am in pain, there appears to be nothing wrong, so therefore nothing I can do about it.