Trismus, also known as lockjaw, is caused by trauma or injury to the mastication (chewing) muscles. You need your mastication muscles for chewing your food and opening your mouth. Without it, it would ...

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 ...

A tight jaw can result from stress, anxiety, inflammation, or injury. Overexerting the jaw, such as by chewing too much, can also cause muscle tightness. Treatment can depend on the cause. Preventive ...

As people age, the shape of their face begins to change. As fat builds up in the neck, the skin begins to sag and the jaw muscles begin to shrink. This may cause your jawline to become less defined.