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*根据参考疼痛图，原发性或中枢性trp是指在压力下局部引起剧烈疼痛的trp。通常以腹部肌肉中心为基础。*继发或伴发trp是对周围肌肉现有的中央触发点的反应。当中心TrP愈合时，它们通常会自发地消退。可以以集群的形式出现。

*活动TrP是触诊时引起压痛和牵涉性疼痛的任何点。触诊也可能引起自主神经症状，如皮肤发红、出汗和头晕<参考文献>Pringle K. [https://www.jmptonline.org/article/S0161-4754(99)70079-5/abstract肌筋膜疼痛和功能障碍:触发点手册]。手法与生理治疗。1999年6月1日;22(5):A1.。*潜伏性TrP不会自发引起疼痛，局部或牵涉性疼痛仅发生在强指压Fernández-de-Las-Peñas C, Dommerholt J. [https://academic.oup.com/painmedicine/article-abstract/19/1/142/4091339肌筋膜触发点诊断标准和临床考虑的国际共识:一项德尔菲研究]。疼痛医学，2018;19(1):142-50.。 They may change muscle activation patterns or cause muscle weakness in pain-free patientsGe HY, Monterde S, Graven-Nielsen T, Arendt-Nielsen L. Latent Myofascial Trigger Points Are Associated With an Increased Intramuscular Electromyographic Activity During Synergistic Muscle Activation. The journal of pain. [https://www-sciencedirect-com.ezproxy.library.uq.edu.au/science/article/pii/S1526590013013187 2014;15(2):181–7.]Celik D, Yeldan İ. [https://content.iospress.com/articles/journal-of-back-and-musculoskeletal-rehabilitation/bmr00302 The relationship between latent trigger point and muscle strength in healthy subjects: a double-blind study]. Journal of Back and Musculoskeletal Rehabilitation. 2011 Jan 1;24(4):251-6.. * Reproduction of painful symptoms is the diagnostic criterion differentiating between the two.

* Commonly happen in case of severe postural deformity where initially primary TrPs are multiple, so secondary multiple TrPs are only a response of a mechanism, called diffuse.

* Arise in tendo-osseous junctions which become very tender. If not treated, degenerative processes of an adjacent joint can spring up.

* Even ligaments can develop trigger points. Presence of TrPs in the anterior longitudinal ligament of the spine can result in neck instability. Some knee pain syndromes are successfully healed when treated ligamentum patellae and fibular collateral ligament.