Is there a link between tmj and lower back pain?

Not lower back: It is common to have many musculature pain symptoms. The upper back or trapesius muscles can be painful as an effect of the whole neuro-muscular cause and effect of TMJ disorders. I have not seen any lower back symptoms in my practice directly attributable to the tmj.

Possibly: Tmj and postural issues have long been related to one another...The famous chicken or the egg type question arises. Evaluation by a qualified physical therapist and/or dentist who understands that relationship is a great place to start.

Possible: When you open your mouth the muscles in the back of your head help hold your head still as your jaw moves. Some of these muscles extend down to the middle/lower back, so a problem could have effects that far as a result with the joint movements, but be sure to rule out other problems with your physician unless you have a clean bill of health from your md already.

Uncommon: Uncommon in my practice. However some patients have "systemic" joint problems that affect many joints.