What could cause ear crackling when i move my jaw?

TMJ: The most likely explanation is the temporomandibular joint (tmj). This joint is located just in front of the ear canal, and the sounds of the joint movements can often be detected by the nearby ear. This is called crepitus, the crunchy, crackling noise of the joint . Inflammation of the TMJ usually produces more noticeable crepitus. Other causes are hairs or wax in the ear canal.

Joints Problems: If you hear noises when you move your jaw, such as popping, clicking or grinding, you are experiencing temporomandibular joint disorder, when the mandibular bone moves against the temporal bone, the movement may not be smooth due to changes in the surfaces of the bone and the disk seperating the 2 bones, think of it as of osteoarthritis of the condyles., it can be painful and have other symptoms, .

Scar tissue : If your disc is dislocated and fused to the bone above, scar tissue will form to act as a false disc so bone does not rub on bone. You may be hearing the sound of the jaw moving over the scar tissue. It is a very common condition with no treatment recommended. Just live with it if it is not associated with pain.

TMJ: Sounds like tmj, or temporomandibular joint dysfunction.