TMJ jaw pain happens occurs when there some kind of complication with the Temporomandibular Joint. This results in headaches in many case. So there is a direct relationship between TMJ and Headaches.

TMJ is the joint that is responsible for connecting the lower jaw bone with the skull. The fact is that this joint is used at a regular level, as we make the use of it in mouth exercises like eating and talking. People who suffer from TMJ jaw pain may feel pain when any kind of movement is done in the joint, or in severe cases patients may suffer from pain all the time no matter whether the motion is occurring in the jaw or not.
Many times, the joint is affected with the alignment and fitting of the teeth.

If the alignment of the teeth is not done in a proper way or correctly, then the direct impact falls on the way as to how the jaw moves and this may result in swelling in the jaw as well.

The biggest factor that the patients have to face is the increase in stress level.
It has been noticed that the patients experiencing stress often grind their teeth at night or clench their teeth when they experience an increase in their stress level.

The activity of grinding and clenching is responsible for adding pressure on the jaw joint, and the chances are that immense swelling may occur which further adds pressure on the the nerves.
The main symptom of this disorder is jaw pain. It can be a regular pain and can rise up to an immense pain as well. The pain is directly addressed in the jaw joint-- especially when a person in indulged in eating and chewing.
Other symptoms are:

Headaches, ear aches or ringing in the ears, neck pain, clicking or popping if the jaw, immense locking of the jaw, as well as other types of pain on the face.