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Whenever I yawn, my neck muscles spasm for like 20 seconds then calm down. Why?
May 13, 2013

Dr. Zakia Dimassi Pediatrics
If you open your mouth very wide as you yawn, your jaw may be displaced. Another explanation is a temporo-mandibular joint (TMJ) inflammation, this is the joint between the lower and upper jaws, you can feel it just in front of your ears (feel it as you open your mouth), if it hurts when you apply mild pressure on it then it may be inflamed. A common cause is bruxism (teeth grinding during sleep). Another cause can be poor sleep positioning.
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