It also occured to me (20-20 hindsight) that some trigger points can return (or other problems be created) if the treatment is not followed up properly with further massage, stretching exercises, etc. - sometimes on the opposite side of the body than the original trigger point. This was explained (and stressed) by my therapist (I don't recall if the books/videos go into it sufficiently) as a 'balancing'. It's been a while, so my memory is a bit fuzzy, but we learned it as part of the process, so it's become automatic and we don't think about it - just do it.

Doc