Can tmj cause ears hissing/ringing? ear dull aches and ear itching? laying down moving jaw forward changes sound. mri of ear and brain were good.

Yes Take home test!: It sounds like you have a TMJ problem. The reason the sound changes when you move you jaw forward is you are moving the condyle down and forward freeing the joint to function normally. When you do this usually the sound goes away. (clicking and popping) A good test is to open an close and listen for clicking and popping.Then bite on a cotton tip applicator (Qtip) open and close-no more noise.

Sometimes: Popping sounds in the ear during jaw movement are caused by the TM joint but constant ear ringing or hissing is a very poorly understood symptom. The jaw muscles and the joint can be causing ear sounds but conservative and reversible treatments should be tried due to lack of much scientific data. Ear pain and ear stuffiness in absence of an ear pathology may be more predictably caused by TMJ.