Background: Myofascial trigger points (MTrPs) are hyperirritable ... IZ and MTrPs are located in well-defined areas in upper trapezius muscle. Moreover, MTrPs in upper trapezius are proximally ...

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Medically reviewed by Jennifer Steinhoff, MD Myofascial pain syndrome, a very common condition, is a collection of signs and symptoms in a particular area of the body. Myofascial pain syndrome is not ...