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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.
One common cause of pain below the jaw is swollen lymph nodes. These nodes are involved in fighting off infections in the mouth and throat, so any sore throat, cold, or tooth infection might cause these glands to swell, which can be uncomfortable.