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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.
Other Causes For Jaw Pain And Headache On One Side. 1  Nasal problems and sinusitis causing inflammation of sinuses and pain in cheekbone and jaw. Blocked nasal passages, foreign body impaction, infection or injuries can also cause jaw pain and headache on the affected side.