Pain related to a discrete, irritable point in skeletal muscle or fascia, not caused by acute local trauma, inflammation, degeneration, neoplasm or infection.
The painful point can be felt as a nodule or band in the muscle, and a twitch response can be elicited on stimulation of the trigger point.
Palpation of the trigger point reproduces the patient’s complaint of pain, and the pain radiates in a distribution typical of the specific muscle harboring the trigger point.