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The temporomandibular joint connects the lower jaw to the temporal bone of the skull and is responsible for bringing the lower and upper jaws together. It is one of the most frequently used joints in the body. Depending on the underlying cause, jaw pain can occur suddenly or build up over time.
View All. Finding out what causes jaw pain can sometimes be difficult, since the pain can come from the muscles, nerves, or bones in the jaw or from areas of the body you'd never suspect. (For example, sudden jaw pain can be a symptom of a heart attack.) When jaw pain arises from a problem in another area of the body, it's called referred pain.