Trigger points are taut bands of muscle that send pain to other areas of the body. Oftentimes people with trigger points might suffer pain in one area of the body, like the lower back, and not realize that the pain is actually originating on the other side of the body (the psoas, in this case). The field of trigger point therapy was pioneered by Dr. Janet Travell, personal physician to John F. Kennedy. After Travell's 40-plus years of work, she co-wrote a (very expensive) two-volume, 1600 page book detailing over 700 trigger point locations and their effects on the human body.
For those of you who don't want to spend a few hundred dollars on
