Temporomandibular disorders (TMD) involves the two joints that attach the lower jaw (mandible) to the skull. These two joints open and close the mouth, and are located directly in front of your ears.
You may have TMD if:
Researchers do not exactly know what causes TMD. Some people have had accidents or injuries involving their jaw, but many others have had no such incident. Some of the possible causes include:
TMD symptoms may originate within the joint itself or from the muscles that surround the joint. The treatment of these two variants of TMD may differ.
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Last reviewed February 2013 by Peter Lucas, MD; Brian Randall, MD
Last Updated: 4/5/2013