What is the difference between ear pain from an ear infection vs tmj?

TMJ vs Ear Infection: They may feel the same to you and it is not something that you can self diagnose. See both your PCP or ENT specialist and a dentist with knowledge of TMD\TMJ issues to find out what's going on in your particular case. It's not inconceivable that one has both problems at the same time.

TMJ: Apples versus oranges. One is due to the inflammation of infection, the other is an anatomic derangement producing pain from malalignment of the joint space . One has nothing to do with the other.

Earache vs TMJ: An earache is a sharp, dull, or burning pain in one or both ears caused by an ear infection. About 50% of patients with a TMJ disorder have ear pain and do not have signs of ear infection, because of the referral pain. The cause of the pain and the site of the pain is different. Proper diagnosis is the key to successful treatment. See orofacial pain specialist for evaluation.

Often the same.: both are caused by swelling tissue sending electric signal to brain "Houston, there is a problem". One comes from the jaw joint and one from inner or outer ear. The brain changes these signals into pain. It can make both of them feel the same. Evaluation with someone who specializes in TMJ might be helpful and protect you from useless antibiotics.

Similar: Similar. Hard to tell apart just by symptoms. I've seen quite a few "earaches" caused by TMJ that were treated by MDs for "ear infection" even after looking in the ear. An examination by an astute clinician can easily differentiate.