As described by Janet Travell and David Simons, a myofascial trigger point is "A hyper-irritable spot in skeletal muscle that is associated with a hypersensitive palpable nodule in a taut band." Trigger points are quite real, but can be subject to woo propagated by alternative medicine practitioners, most notably massage therapists.
- Travell, Janet; Simons David; Simons Lois (1999). Myofascial Pain and Dysfunction: The Trigger Point Manual (2 vol. set, 2nd Ed.). USA: Lippincott Williams & Williams. ISBN 0-683-08363-5.