Add Yahoo as a preferred source to see more of our stories on Google. If you're suffering from frequent head pain, the common (but under-the-radar trigger) may actually be tense jaw muscles. When the ...

This jaw-dropping discovery focuses on the jaw, specifically the masseter: a muscle in the lower jaw that is essential for chewing. Do humans have a body part that has never been seen before?

A few weeks ago, I had an appointment with David Reavy, a Chicago-based physical therapist known for his work with professional athletes in the NFL and NBA. As he poked and prodded my body during the ...