Lockjaw (trismus) is a painful condition that limits your ability to open your mouth all the way. It occurs when the muscles you use to chew spasm, meaning they can’t relax completely. The term ...

I still remember the first time it happened. I was yawning—just a normal, lazy Saturday morning stretch—and suddenly, a sharp click echoed from my jaw. Then came the tension. Then came the pain. I ...

A tight jaw can happen for many reasons, such as stress, temporomandibular joint disorders, grinding the teeth at night, and tetanus, among others. Share on Pinterest Nes/Getty Images Jaw tightness ...