Temporomandibular joint disorder, commonly known as TMJ or TMD, is a term used to describe symptoms affecting the temporomandibular joint – the joint that attaches the lower jaw to the side of the head. You can feel it if you situate your fingers on the side of the face underneath the ears.

TMJ disorder is relatively common, but it is not fully understood by many people. A lot of patients will have been diagnosed with TMJ disorder without really knowing what it is and research into symptoms and signs of TMJ disorder are on-going.