This is also known as Temporo-Mandibular Jaw (TMJ) pain. It is similar to dull toothache or wisdom tooth pain but is essentially muscular/myofascial pain. It is sometimes difficult to locate and there may be pain in the jaw joint and all the surrounding structures. In acute cases jaw opening may be limited.
One in four people
at some time may have symptoms. Men and women are affected equally,
although women tend to seek treatment more often.
The commonest cause is tooth
clenching or grinding and is often associated with stress and anxiety.
Normally one is not aware of clenching their teeth. This is usually
carried out while concentrating; at work, driving, doing the ironing
etc.
There are day and night tooth grinders. Night grinding while sleeping is more destructive and difficult to deal with.
Increased muscle activity
(the jaw muscles are the ones doing the extra work during tooth
grinding/clenching). These muscles get tired and go into spasm,
a cramp-like condition.