The role of extraocular and facial muscle trigger points in cephalalgia.

Trigger points play a part in the development and maintenance of chronic headache states. This article reviews the physiology of trigger points, with a focus on the -latest understanding of their biochemistry. The importance of facial muscle and extraocular muscle trigger points is only beginning to be understood; the data exploring their role in headache are reviewed. The concept of central sensitization and the way in which it relates to trigger points and headache is explained, along with treatment strategies for helping patients with their pain.