TMJ is an inflammation of the temporomandibular joint, the joint between your jawbone and your skull. You can feel this joint on your cheek just below and slightly in front of your earlobe.
Inflammation in this joint causes the painful symptoms associated with TMJ, including jaw pain, headaches, facial pain, and difficulty chewing.
TMJ is diagnosed with a careful assessment of your symptoms and examination of your mouth and jaws for signs and causes of inflammation. TMJ can be caused by stress, bite alignment issues, chewing gum or fingernails, or conditions such as arthritis.