Definition of TMJ
TMJ stands for temporomandibular joint, which is your jaw joint. Everyone has two of these: a left and right. TMJ syndrome or TMD (temporomandibular disorder) is a medical problem related to the function of the jaw joint. This typically manifests itself as a popping, clicking, or rustling in the jaw joint and can be accompanied by jaw joint or muscle pain, a jaw that locks in position or is difficult to open, headaches, fullness or ringing in the ears, and even numbness in the face and fingertips.