Electromyography (The rigidity of the neck muscles is related to tension type headaches. Consequently, an electromyography displays how much the neck and facial muscles are contracting.)
More about tension type headache:
Tension type headaches (TTH) are frequent headache attacks that might last for a few minutes to several weeks. The pain is often bilateral, mild to moderate in severity, pressing or tightening in nature, and does not get worse with regular physical exercise.
The International Classification Headache Diagnosis I (ICHD I) selected the term "tension type headache" (TTH) in 1988, and ICHD II kept it in use in 2004.
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